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Solve each of the following quadratic equations:
Given:
taking LCM
using (a + b)2 = a2 + b2 + 2ab; (a - b)2 = a2 + b2 - 2ab
19x2 - 42x - 15 = 30x2 + 35x - 15 cross multiplying
11 x2 + 77x = 0
11x(x + 7) = 0 taking 11x common
11x = 0 or (x + 7) = 0
x = 0 or x = - 7
Hence the roots of equation are 0, - 7