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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


Sagot :

Answer:

[tex]12x^2+8x-9[/tex]

Step-by-step explanation:

[tex]\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}[/tex]