(x^2 + x)^2 + 4 ( x^2 + x)-12
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(x²+x)² +4(x²+x)- 12
=(x²+x)+6(x²+x) -2(x²+x) -12
=(x²+x)[(x²+x)+6]-2[(x²+x)+6]
=(x²+x+6)(x²+x-2)
=(x²+x)+6(x²+x) -2(x²+x) -12
=(x²+x)[(x²+x)+6]-2[(x²+x)+6]
=(x²+x+6)(x²+x-2)
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