Factor this trinomial.

x2 - 8x + 15

A. (x - 1) (x - 15)

B. (x - 3) (x + 5)

C. (x - 3) (x - 5)

D. (x - 1) (x + 15)

To factor x^2 - 8x + 15, we find two numbers that multiply to get 15 and add to get - 8. These two numbers can be - 5 and - 3. Therefore, this factors as

x^2 - 8x + 15 = (x-5) (x-3)

X^2 - 8 x+15=0

x^2-5x - 3x + 15=0

x (x-5) - 3 (x-5)

(x-5) (x-3)