Question 3 (iii)

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

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Solution

$x^{2} + 2 x + 1 = (- 1)^{2} + 2 (- 1) + 1$ [Putting x = -1]
= 1 – 2 + 1 = 2 – 2 = 0

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x = - 1

x^{2} + 2 x + 1

Question 3 (i)

Find the value of the following expression, when x = -1:
2x - 7

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

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

(iv) 2x² − x − 2

Question 3 (iv)

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

x = - 1

x^{2} + 2 x + 1

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