Answer
$15x^{2}+17x-4$
Work Step by Step
Multiplying each term of the first parenthetical expression with the entire of the second parenthetical expression, we obtain:
$(5x-1)(3x+4)$
=$5x(3x+4)-1(3x+4)$
=$15x^{2}+20x-3x-4$
=$15x^{2}+17x-4$