p ^ { 2 } - p - 42 by p + 6 – InterviewSolution

1.	p ^ { 2 } - p - 42 by p + 6
Answer» pp - p - 42 = pp - 7p + 6p - 42 = (p-7)(p+6) (p-7)(p+6)/(p+6) = p-7

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