Question

What value of b makes this equation true?:x2 + bx – 35 = (x + 5)(x - 7) a) 12 b) 2 c)-2 d)-12

Answer 1

c) -2.

Explanation:

(x + 5)(x - 7)

= x^2 - 7x + 5x - 35

= x^2 - 2x - 35

Compare with

x^2 + bx - 35

we see that b = -2.