## Algebra 1: Common Core (15th Edition)

$10s^2-7s-12$
To use the FOIL method, we multiply the first terms of each binomial, the first term of the first binomial and the last term of the second binomial, the last term of the first binomial and the first term of the second binomial, and the last terms of each binomial. We then find the sum of these products and combine the like terms to get our answer. When we apply this method to $(2s-3)(5s+4)$, we get the answer $10s^2-7s-12$, which is already in standard form because the exponents of the terms descend from left to right.