Simplify the expression and find the value, if $x = 2$ .
$3 (x + 2) + 5 x - 7$

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Solution

$3 (x + 2) + 5 x - 7$
$= 3 x + 6 + 5 x - 7$
$= 8 x - 1$
if x=2
$8 n - 1$
$= 8 \times 2 - 1$
$= 16 - 1 = 15$

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Question 6 (ii)

Simplify the expression and find the value if x is equal to 2:
3(x + 2) + 5x - 7

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{2 x}^{2} - 3 y + {3 x}^{2} + {5 x}^{2} + 5 x - 7 - 7 x + 2 y

Simplify the expressions and find the value if x is equal to 2

(i) x + 7 + 4 (x − 5) (ii) 3 (x + 2) + 5x − 7

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5 x^{2} - 4 - 3 x^{2} + 6 x + 8 + 5 x + 3

x = - 2

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