how to factorize 4 x square - X - 4
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4x^2-x-4=o
4x^2-4x+4x-4=0
4x^2-4x+4x-4=0
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4x^2-x-4=0
4x^2-4x+4x-4=0
4x(x-1)+4(x-1)=0
(x-1)(4x+4)=0
X-1=0 or x=1
Or 4x+4=0 ,x=-4/4=-1