if x²+7ax+40 and x²+2ax-60 have a common factor then find the value of a.
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a=2 or a=(-2)
when a=2 the common factor is (x+10)
when a=(-2) the common factor is (x-10)
when a=2 the common factor is (x+10)
when a=(-2) the common factor is (x-10)
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