Book: RS Aggarwal - Mathematics
Chapter: 10. Quadratic Equations
Subject: Maths - Class 10th
Q. No. 7 of Exercise 10B
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7
Solve each of the following equations by using the method of completing the square:
8x2 - 14x - 15 = 0
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 
