Q. 7

Solve each of the following equations by using the method of completing the square:

8x2 - 14x - 15 = 0

Answer :

Given: 8x2 - 14x - 15 = 0

16x2 - 28x - 30 = 0 (multiplying both sides by 2)


16x2 - 28x = 30


(adding on both sides)


using a2 - 2ab + b2 = (a - b)2


(taking square root on both sides)





Hence the roots of equation are


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