# Chapter R - Section R.4 - Factoring Polynomials - R.4 Exercises: 36

(3s - t)(4s + 5t)

#### Work Step by Step

Check factorization with FOIL: (3s - t)(4s + 5t) = 3s(4s) + 3s(5t) - t(4s) - t(5t) = 12$s^{2}$ + 15st - 4st - 5$t^{2}$ = 12$s^{2}$ + 11st - 5$t^{2}$

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