Question

the area of a rectangular painting is given by the trinomial x2+2x-15
a. (x+5) and (x-3)
b. (x+5) and (x+3)
c. (x-5) and (x-3)
d. (x-5) and (x+3)

Answer 1

Which one of these pairs multiply to get the value? Trying each one, you get
a

Answer 2

By FOIL, you get for a,x2-5x+3x-15, or the x2+2x-15

Answer 3

You can also factor manually, but I will not go over that here. if you don't know, look up the quadratic equation