Answer 2.3:4

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m (Svar 2.3:4 moved to Answer 2.3:4: Robot: moved page)
 

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a) \displaystyle ax^2-ax-2a=0\,, where \displaystyle \,a\ne 0\, is a constant.
b) \displaystyle ax^2-2ax-2a=0\,, where \displaystyle \,a\ne 0\, is a constant.
c) \displaystyle ax^2-(3+\sqrt{3}\,)ax+3\sqrt{3}\,a=0\,, where \displaystyle \,a\ne 0\, is a constant.