Answer:
x² + 3x - 40 = (x + 8)(x - 5)
Step-by-step explanation:
When factoring a trinomial of the form x² + ax + b, find 2 factors of b whose sum is a.
In this case, find 2 factors of -40 that add to 3.
The two factors are 8 and -5.
x² + 3x - 40 = (x + 8)(x - 5)
