Question

Need help multiple choice please!

Answer 1

it is A

Explanation:

you need to distribute the terms
`3x^2` and -4 into their respective parentheses.

`3x^2*x =3x^3`

`3x^2*3=9x^2`

so the left side completed is
`3x^3+9x^2`

next do the other side

`-4*1 =-4`

`-4*-2x^2 =8x^2` (remember - * - = +)

Right side complete is
`-4+8x^2+7`

both put together is
`3x^3+9x^2-4+8x^2+7`

combine like terms to get

`3x^3+17x^2+3`