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factorability of a trinomial

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How would you use this procedure (factoring a quadratic expression with leading coefficient a = 1) to determine if a given polynomial is prime, that is, determine that it cannot be factored into a product of two linear polynomials

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This solution explores the factorability of a trinomial.

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To determine the factorability of a trinomial in the form ax2 + bx + c when a = 1 we need to find the factors of c. As an example lets look at:

x2 + x - 20

a = 1
b = 1
c = -20

Since a = 1, all we need to ...

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