Question

ASAP PLZ!!! Select the correct answer. Which equation cannot be solved by factoring? A. x2 + 5x − 4 = 0 B. x2 + 6x + 9 = 0 C. x2 + 3x − 4 = 0 D. x2 − x − 6 = 0

Answer 1

Answer:A

Step-by-step explanation:

B can be factorised to (x +3) (x + 3)

C can be factorised to (x - 1) (x + 4)

D can be factorised to (x + 2) (x - 3)

Answer 2

Answer:

Step-by-step explanation:

We have four equations here.  Let's actually solve them, using factoring if possible and some other method if factoring is not possible.

A)  x^2 + 5x + 4 factors into (x + 1)(x + 4), but x^2 + 5x - 4 does not.

B)  x^2 + 6x + 9 factors into (x + 3)^2.

C) x^2 + 3x - 4 factors into (x + 4)(x - 1).

D) x^2 - x - 6 factors into (x - 3)(x + 2)

x^2 + 5x - 4 = 0 can be solved, but not by factoring.