Question

When factored, the trinomials x2 + 4x − 21 and x2 + 11x + 28 have one binomial factor in common. What is this factor?

x − 7
x + 7
x − 5
x + 5


Helpppppp

Answer 1

x + 7

Explanation:

x^2 + 4x − 21 =

= (x + 7)(x - 3)

x^2 + 11x + 28 =

= (x + 4)(x + 7)

Answer: x + 7