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WAEC Mathematics 2021 Paper

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Question : 3

Total: 49

Solve: 2

^{\sqrt{2x+1}}

= 32

13
24
12
11

Solution:

2 $^{\sqrt{2x+1}}$ = 32

2 $^{\sqrt{2x+1}}$ = 2 $^{5}$

$\sqrt{2x+1}$ = 5

square both sides

2x + 1 = 5 $^{2}$

2x + 1 = 25

2x = 25 - 1

2x = 24

x = $\;\frac{24}{2}$

x = 12

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