Question

PLSSSS HELP !!!! 1. Add the polynomials. (3x + 8x ²) + (4x²+5x-9)

O 2x²+6x-9
O 12x²+8x - 9
O 7x²+13x-9
O -6x²+6x-9

Answer 1

`12x^2+8x-9`

Explanation:

`\begin{aligned}&\textsf{Given expression}: \quad & (3x+8x^2)+(4x^2+5x-9)\\&\textsf{Remove the parentheses}: \quad & 3x+8x^2+4x^2+5x-9\\&\textsf{Collect like terms}: & 8x^2+4x^2+3x+5x-9\\&\textsf{Combine like terms}: & 12x^2+8x-9\end{aligned}`