Solution 2.3:5c

From Förberedande kurs i matematik 1

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m (Lösning 2.3:5c moved to Solution 2.3:5c: Robot: moved page)
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If
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<center> [[Image:2_3_5c.gif]] </center>
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<math>x=\text{1 }</math>
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is a root of the equation, the equation should be satisfied if we substitute in
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<math>x=\text{1 }</math>
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into it,
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i.e.
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<math>1^{2}+4\centerdot 1+b=5+b</math>
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should be equal to zero, and this gives directly that
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<math>b=-\text{5}</math>.

Revision as of 10:00, 21 September 2008

If \displaystyle x=\text{1 } is a root of the equation, the equation should be satisfied if we substitute in \displaystyle x=\text{1 } into it,

i.e.

\displaystyle 1^{2}+4\centerdot 1+b=5+b should be equal to zero, and this gives directly that \displaystyle b=-\text{5}.

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