Factorise the following.
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x²+xy+9x+9y,
x(x+y)+9(x+y),
(x+y)(x+9)
x(x+y)+9(x+y),
(x+y)(x+9)
Answered by
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x²-15x+56
=x²-7x-8x+56
=x(x-7)-8(x-7)
=(x-7)(x-8)
x²+8x+15
=x²+5x+3x+15
=x(x+5)+3(x+5)
=(x+3)(x+5)
=x²-7x-8x+56
=x(x-7)-8(x-7)
=(x-7)(x-8)
x²+8x+15
=x²+5x+3x+15
=x(x+5)+3(x+5)
=(x+3)(x+5)
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