Question 940840
My son is trying to solve 9x2+7x-56 he believes it cannit be factored. 
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It's not an equation, so there's nothing to solve.
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It cannot be factored with integers.  That's the definition of prime.
Any 2nd order polynomial can be factored with its roots, but that would mean there are no prime polynomials --> no prime numbers.
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In short, your son is correct, it cannot be factored.