Factorise
x³+3x²+3x-7
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Answer:
x³+3x²+3x-7
=x³+3x².1+3.x.12+13-8
=(x+1)3-(2)3
=(x+1-2){(x+1)2+2.(x+1)+22}
=(x-1)(x2+2x+1+2x+2+4)
=(x-1)(x2+4x+7)
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