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(x + a)(x +b)= x^2 + x(a+ b) + ab

Find the valu...

Question

Find the value of $2 x^{2} - x - 2$ at $x = - 1$ .

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Solution

At $x = - 1$ , value would be $= 2 (- 1)^{2} - (- 1) - 2$
$= 2 + 1 - 2 = 1$ .

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