# Chapter R - Section R.4 - Factoring Polynomials - R.4 Exercises: 57

(a + b + 4)(a + b - 4)

#### Work Step by Step

We know that (a + b)(a - b) = $a^{2}$ - $b^{2}$, so we take the square root of each term in the polynomial to get a and b. We get (a + b) and 4, so the factorization is ((a + b) + 4)((a + b) - 4) = (a + b + 4)(a + b - 4)

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