Question

Factor the following polynomial to find its roots x^2-4x-21

Answer 1

(x+3)(x−7)

Explanation:

Break the expression into groups.

=(X^2+3x)+(-7x-21)

Factor out x from x^2+3x: x(x+3)

Factor out -7 from -7x-21: -7(x+3)

=x(x+3)-7(x+3)

Factor out common term x+3

=(x+3)(x-7)

Glad I could help!!