Factorise x² + xy (1+y) + y³
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x²+xy(1+y)+y
x²+xy(1+y)+y
x²+xy(1+y)+y =x?+xy+xy²+y
x²+xy(1+y)+y =x2+xy+xy 3+y² = x(x+y) =+y°(x+y)
x²+xy(1+y)+y =x²+xy+xy²+y³ = x(x+y) +y²(x+y)=(x+y)(x+y)
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