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Finding the Value of an Expression

iv Find the v...

Question

Question 3 (iv)

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

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Solution

$2 x^{2} - x - 2 = 2 (- 1)^{2} - (- 1) - 2$ [Putting x = -1]
$= 2 \times 1 + 1 - 2 = 2 + 1 - 2$
= 3 – 2
= 1

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Finding the Value of an Expression

Standard VII Mathematics

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