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F(x)=x2-2x-8

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F(x)=x2-2x-8

Posted by Rishabh Joshi 6 years, 9 months ago

Yogita Ingle 6 years, 9 months ago

x2 - 2x - 8
x2 - 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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CBSE > Class 10 > Mathematics

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