factorise (x2+7x+12=0)
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x²+3x+4x+12=0
x(x+3)+4(x+3)=0
(x+4)(x+3)=0
x= -4, -3
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Answer:
=x²+4x+3x+12
=x(x+4)+3(x+4)
=(x+4)(x+3)
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