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F(x)=x2-2x-8 |
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Answer» x2 - 2x - 8x2 - 4x + 2x - 8= x (x - 4) + 2 ( x - 4)= ( x + 2) (x - 4) f (X)= X2-2X-8 = X2+X (4-2)-8 = X2+4X-2X-8 = X (X+4)-2 (X+4) = (X-2) (X+4) (X-2)= 0 X= 2 (X+4)= 0 X=-4 |
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