Asked by Jady
Factorise
X^2y + x^2 -4xy- 16
X^2y + x^2 -4xy- 16
Answers
Answered by
oobleck
x^2y + x^2 -4xy- 16
= xy(x-4) + x^2-16
= xy(x-4) + (x+4)(x-4)
= (xy+x+4)(x-4)
= xy(x-4) + x^2-16
= xy(x-4) + (x+4)(x-4)
= (xy+x+4)(x-4)
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