Question

Factor x2 – 8x + 15.

Which pair of numbers has a product of ac and a sum of b?



What is the factored form of the trinomial?

Answer 1

x^2-8x+15

X^2+(a+b)X+ac

=X^2-(5+3)X+(1)(15)

a+b=8

ac=15

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

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

=(x-3)(x-5)

Answer 2

a) -3 and -5

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

Explanation: