2.3 Exercises

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{{Ej vald flik|[[2.3 Andragradsuttryck|Teori]]}}
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{{Ej vald flik|[[2.3 Andragradsuttryck|Theory]]}}
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{{Vald flik|[[2.3 Övningar|Övningar]]}}
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{{Vald flik|[[2.3 Övningar|Exercises]]}}
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===Övning 2.3:1===
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===Exercise 2.3:1===
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Kvadratkomplettera f&ouml;ljande uttryck
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Complete the square of the expressions
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</div>{{#NAVCONTENT:Svar|Svar 2.3:1|Lösning a|Lösning 2.3:1a|Lösning b|Lösning 2.3:1b|Lösning c|Lösning 2.3:1c|Lösning d|Lösning 2.3:1d}}
</div>{{#NAVCONTENT:Svar|Svar 2.3:1|Lösning a|Lösning 2.3:1a|Lösning b|Lösning 2.3:1b|Lösning c|Lösning 2.3:1c|Lösning d|Lösning 2.3:1d}}
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===Övning 2.3:2===
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===Exercise 2.3:2===
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<div class="ovning">
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L&ouml;s f&ouml;ljande andragradsekvationer med kvadratkomplettering
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Solve the following second order equations by completing the square
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</div>{{#NAVCONTENT:Svar|Svar 2.3:2|Lösning a|Lösning 2.3:2a|Lösning b|Lösning 2.3:2b|Lösning c|Lösning 2.3:2c|Lösning d|Lösning 2.3:2d|Lösning e|Lösning 2.3:2e|Lösning f|Lösning 2.3:2f}}
</div>{{#NAVCONTENT:Svar|Svar 2.3:2|Lösning a|Lösning 2.3:2a|Lösning b|Lösning 2.3:2b|Lösning c|Lösning 2.3:2c|Lösning d|Lösning 2.3:2d|Lösning e|Lösning 2.3:2e|Lösning f|Lösning 2.3:2f}}
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===Övning 2.3:3===
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===Exercise 2.3:3===
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L&ouml;s f&ouml;ljande ekvationer direkt
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Solve the following equations directly
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</div>{{#NAVCONTENT:Svar|Svar 2.3:3|Lösning a|Lösning 2.3:3a|Lösning b|Lösning 2.3:3b|Lösning c|Lösning 2.3:3c|Lösning d|Lösning 2.3:3d|Lösning e|Lösning 2.3:3e|Lösning f|Lösning 2.3:3f}}
</div>{{#NAVCONTENT:Svar|Svar 2.3:3|Lösning a|Lösning 2.3:3a|Lösning b|Lösning 2.3:3b|Lösning c|Lösning 2.3:3c|Lösning d|Lösning 2.3:3d|Lösning e|Lösning 2.3:3e|Lösning f|Lösning 2.3:3f}}
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===Övning 2.3:4===
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===Exercise 2.3:4===
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Best&auml;m en andragradsekvation som har r&ouml;tterna
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Determine a second-degree equation which has roots
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|width="100%" | <math>-1\ </math> och <math>\ 2</math>
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|width="100%" | <math>-1\ </math> and <math>\ 2</math>
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|b)
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|width="100" | <math>1+\sqrt{3}\ </math> och <math>\ 1-\sqrt{3}</math>
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|width="100" | <math>1+\sqrt{3}\ </math> and <math>\ 1-\sqrt{3}</math>
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|c)
|c)
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|width="100" | <math>3\ </math> och <math>\ \sqrt{3}</math>
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|width="100" | <math>3\ </math> and <math>\ \sqrt{3}</math>
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</div>{{#NAVCONTENT:Svar|Svar 2.3:4|Lösning a|Lösning 2.3:4a|Lösning b|Lösning 2.3:4b|Lösning c|Lösning 2.3:4c}}
</div>{{#NAVCONTENT:Svar|Svar 2.3:4|Lösning a|Lösning 2.3:4a|Lösning b|Lösning 2.3:4b|Lösning c|Lösning 2.3:4c}}
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===Övning 2.3:5===
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===Exercise 2.3:5===
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<div class="ovning">
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|width="100%" | Best&auml;m en andragradsekvation som bara har <math>\,-7\,</math> som rot.
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|width="100%" | Determine a second-degree equation which only has <math>\,-7\,</math> as a root.
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|b)
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|width="100" | Best&auml;m ett v&auml;rde p&aring; <math>\,x\,</math> som g&ouml;r att uttrycket <math>\,4x^2-28x+48\,</math> &auml;r negativt.
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|width="100" | Determine a value of <math>\,x\,</math> which makes the expression <math>\,4x^2-28x+48\,</math> be negative.
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|c)
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|width="100" | Ekvationen <math>\,x^2+4x+b=0\,</math> har en rot <math>\,x=1\,</math>. Best&auml;m v&auml;rdet p&aring; konstanten <math>\,b\,</math>.
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|width="100" | The equation <math>\,x^2+4x+b=0\,</math> has one root at <math>\,x=1\,</math>. Determine the value of the constant <math>\,b\,</math>.
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</div>{{#NAVCONTENT:Svar|Svar 2.3:5|Lösning a|Lösning 2.3:5a|Lösning b|Lösning 2.3:5b|Lösning c|Lösning 2.3:5c}}
</div>{{#NAVCONTENT:Svar|Svar 2.3:5|Lösning a|Lösning 2.3:5a|Lösning b|Lösning 2.3:5b|Lösning c|Lösning 2.3:5c}}
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===Övning 2.3:6===
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===Exercise 2.3:6===
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<div class="ovning">
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Best&auml;m det minsta v&auml;rde som f&ouml;ljande polynom antar
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Determine the smallest value that the following polynomial can take
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===Övning 2.3:7===
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===Exercise 2.3:7===
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Best&auml;m det st&ouml;rsta v&auml;rde som f&ouml;ljande polynom antar
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Determine the largest value that the following polynomials can take.
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===Övning 2.3:8===
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===Exercise 2.3:8===
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Skissera grafen till f&ouml;ljande funktioner
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Sketch the graph of the following functions
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===Övning 2.3:9===
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===Exercise 2.3:9===
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Hitta alla sk&auml;rningspunkter mellan x-axeln och kurvan
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Find all the points where the x-axis and the following curves intersect.
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===Övning 2.3:10===
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===Exercise 2.3:10===
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<div class="ovning">
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Rita in i ett ''xy''-plan alla punkter vars koordinater <math>\,(x,y)\,</math> uppfyller
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In the ''xy''-plane, draw in all the points whose coordinates <math>\,(x,y)\,</math> satisfy
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Revision as of 13:36, 3 August 2008

       Theory          Exercises      

Exercise 2.3:1

Complete the square of the expressions

a) \displaystyle x^2-2x b) \displaystyle x^2+2x-1 c) \displaystyle 5+2x-x^2 d) \displaystyle x^2+5x+3

Exercise 2.3:2

Solve the following second order equations by completing the square

a) \displaystyle x^2-4x+3=0 b) \displaystyle y^2+2y-15=0 c) \displaystyle y^2+3y+4=0
d) \displaystyle 4x^2-28x+13=0 e) \displaystyle 5x^2+2x-3=0 f) \displaystyle 3x^2-10x+8=0

Exercise 2.3:3

Solve the following equations directly

a) \displaystyle x(x+3)=0 b) \displaystyle (x-3)(x+5)=0
c) \displaystyle 5(3x-2)(x+8)=0 d) \displaystyle x(x+3)-x(2x-9)=0
e) \displaystyle (x+3)(x-1)-(x+3)(2x-9)=0 f) \displaystyle x(x^2-2x)+x(2-x)=0

Exercise 2.3:4

Determine a second-degree equation which has roots

a) \displaystyle -1\ and \displaystyle \ 2
b) \displaystyle 1+\sqrt{3}\ and \displaystyle \ 1-\sqrt{3}
c) \displaystyle 3\ and \displaystyle \ \sqrt{3}

Exercise 2.3:5

a) Determine a second-degree equation which only has \displaystyle \,-7\, as a root.
b) Determine a value of \displaystyle \,x\, which makes the expression \displaystyle \,4x^2-28x+48\, be negative.
c) The equation \displaystyle \,x^2+4x+b=0\, has one root at \displaystyle \,x=1\,. Determine the value of the constant \displaystyle \,b\,.

Exercise 2.3:6

Determine the smallest value that the following polynomial can take

a) \displaystyle x^2-2x+1 b) \displaystyle x^2-4x+2 c) \displaystyle x^2-5x+7


Exercise 2.3:7

Determine the largest value that the following polynomials can take.

a) \displaystyle 1-x^2 b) \displaystyle -x^2+3x-4 c) \displaystyle x^2+x+1

Exercise 2.3:8

Sketch the graph of the following functions

a) \displaystyle f(x)=x^2+1 b) \displaystyle f(x)=(x-1)^2+2 c) \displaystyle f(x)=x^2-6x+11

Exercise 2.3:9

Find all the points where the x-axis and the following curves intersect.

a) \displaystyle y=x^2-1 b) \displaystyle y=x^2-5x+6 c) \displaystyle y=3x^2-12x+9

Exercise 2.3:10

In the xy-plane, draw in all the points whose coordinates \displaystyle \,(x,y)\, satisfy

a) \displaystyle y \geq x^2\ och \displaystyle \ y \leq 1 b) \displaystyle y \leq 1-x^2\ och \displaystyle \ x \geq 2y-3
c) \displaystyle 1 \geq x \geq y^2 d) \displaystyle x^2 \leq y \leq x