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given :- 16x² + 60x - 16
=> 16x² + 64x - 4x - 16
=> 16x(x+4) - 4(x+4)
=> (16x - 4)(x + 4)
If it's equal to 0,
then,
(16x - 4)(x + 4) = 0
16x - 4 = 0 or x + 4 = 0
16x = 4 or x = -4
x = 4/16 = 1/4
therefore x = 1/4 or -4
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