pls help me how to do this question
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Split the term −3x2 into −4x2+x2 and 3x into 7x−4x.
x3−3x2+3x+7=x3−4x2+x2+7x−4x+7
=(x3−4x2+7x)+1(x2−4x+7)
=x(x2−4x+7)+1(x2−4x+7)
=(x+1)(x2−4x+7)
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