tatorbugt17 tatorbugt17

11-03-2017
Mathematics

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Without solving the equation, determine the nature of the roots of x^2 - 2x - 8 = 0.

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ghanami ghanami

11-03-2017

Hello
x²-2x-8=0
(x²-2x+1)-1-8=0
(x-1)² -3² =0
(x-1+3)(x-1-3)=0
(x+2)(x-4)=0
x+2=0 or x-4=0
x=-2 or x=4
the roots in Z

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