Question 3 (i)

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

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Solution

2x - 7 = 2(-1) - 7 [Putting x = -1]
= - 2 - 7 = -9

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Question 3 (iii)

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

x = - 1

2 x - 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

x = - 1

2 x - 7

x^{2} - 4 x^{3} + 3 x^{2} - 2 x + 1

x = 1 + i

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