solve 4x2-16x-15=0 by completing square method.
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method to solve a quadratic equation is v have add substract coffecient of (b/2)² of equation ax²+bx+c=0
now 4x² -16x -15=0
4x² - 16x +64 -64 -15 =0
(2x-8)² - 79 = 0
(2x-8)² = 79
now 4x² -16x -15=0
4x² - 16x +64 -64 -15 =0
(2x-8)² - 79 = 0
(2x-8)² = 79
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