Question

Helppp plsssss!!show your work.
Thanks

Answer 1

You are basically just adding, so combine like terms.

3x^2 + 5x^2 = 8x^2

6x - 2x = 4x

4 - 8 = -4

So the answer is D.

Answer 2

The expression for $(f+g)(x)$ is simply the sum of the expressions of $f(x)$ and $g(x)$.

So, you have

$(f+g)(x) = f(x) + g(x) = (3x^2-2x+4)+(5x^2+6x-8) = 8x^2+4x-4$