Q6 of 116 Page 6

Find the value of x, if:

(i)


(ii)


(iii)

(i) 4x = 522 - 482

4x = (52 – 48) (52 + 48)


4x = 4 × 100


4x = 400


x = 100


(ii)


14x = (47 – 33) (47 + 33)


14x = 14 × 80


x = 80


(iii)


Using formula:


a2 – b2 = (a – b) (a + b), we get


5x = (50 – 40) (50 + 40)


5x = 10 × 90


5x = 900


x = 180


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