Answer:
Using quadratic trinomials usi
Steps in factoring x^2 - bx - c, c is negative
Factor x^2 - 9x - 10
Step 1: Find the two integers whose product is -10 and whose sum is -9
-10 x 1 = -10 -10 + 1 = -9
Step 2: Use -10 and -1 to complete the factors.
x^2 - 9x - 10 = (x + 1)(x - 10)
Step 3: Use foil method to check the factors.
(x + 1)(x - 10) = x^2 - 10x + 1x - 10
= x^2 - 9x - 10
Thus, x^2 - 9x - 10 = (x + 1)(x - 10)
