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Question

Find the value of 'x'. [3 MARKS]

(i) 4x+5=25

(ii) x213=512

(iii) (7x+8)÷7=8

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Solution

Each Option: 1 Mark

(i) 4x+5=25

4x=255

4x=20

Divide by 4 on both sides,

4x÷4=20÷4

x=5


(ii) x213=512

x73=112

3x73=112

3x=112×3+7

3x=33+142=472

x=476=756=7.833

(iii) (7x+8)÷7=8

7x+87=8

7x=8×78=568=48

x=487=667=6.86


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