Answer:
x^2+2x-15
Step-by-step explanation:
x^2+5x-3x-15
=x^2+2x-15
x² + 2x -15
by using FOIL method (see attached for reference),
(x-3)(x+5)
= (x)(x) + (x)(5) + (-3)(x) + (-3)(5)
= x² + 5x - 3x -15
= x² + 2x -15
