factorise: x2+8x+16
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X^2+4x+4x+16
Take common as x
X(x+4)+4(x+4)
(X+4)(x+4)
X+4=0 ;x+4=0
X=-4 x=-4
Take common as x
X(x+4)+4(x+4)
(X+4)(x+4)
X+4=0 ;x+4=0
X=-4 x=-4
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