Question

Factor by grouping: 3x^2 + 3 + x^3 + x.
A. (x^2 + 1)(x + 3)
B. (x^2 + 1)(x - 3)
C. (3x^2 + 1)(x + 3)
D. (3x^2 - 1)(x - 3)

Answer 1

One way is to expand each answer and see which one gives the original equation. Or you can practice factorizing equations.

Answer 2

So is A correct? @wolfe8

Answer 3

I'm actually really tired to be doing more math. But yes I believe A is correct.

Answer 4

Thanks.