4x^2+16x-x-4=0
4x^2+15x-4=0
(4x-1)(x+4)
X=1/4ataux=-4
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4x^2+16x-x-4=0
4x^2+15x-4=0
(4x-1)(x+4)
X=1/4ataux=-4
4x(x+4) = (x+4)
4x = 1
x =3