Find the value of the following expressions, when $x = - 1$ :
$2 x^{2} - x - 2$

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Solution

$x = - 1 (Given)$

Therefore,

$2 x^{2} - x - 2$

$= 2 {(- 1)}^{2} - (- 1) - 2$

$= 2 + 1 - 2$

$= 1$

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x = - 1

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Question 3 (iv)

Find the value of the following expressions, when x = -1:
$2 x^{2} - x - 2$

x = - 1

2 x^{2} - x - 2

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x^{2} + 2 x + 1

Find the value of the following expressions, when x = − 1:

(i) 2x − 7 (ii) − x + 2 (iii) x² + 2x + 1

(iv) 2x² − x − 2

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