factotise: (p+1)( p+3)( p+5) (p+7) +15
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(p+1)(p+3)(p+5)(p+7) + 15. = [(p+1 )(p+7)][(p+3)(p+5) ]+ 15. = (p²+8p+7)(p²+8p+15)+15. Let p²+8p+7 = a ---(1). = a(a+8)+15. = a²+8a+15.
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