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Please help!!!

Simplify.

(3x^2 + 2x + 7x^3) + (10x^2 + 6x + 9)

A) 7x^3 + 13x^2 + 8x + 9

B) 7x^3 + 30x^2 + 12x + 9

C) 13x^3 + 8x + 16x^3

D) 13x^4 + 7x^3 + 8x^2 + 9

Respuesta :

wegnerkolmp2741o

Answer:

A) 7x^3 + 13x^2 + 8x + 9

Step-by-step explanation:

(3x^2 + 2x + 7x^3) + (10x^2 + 6x + 9)

I like to line them up vertically

 7x^3 +3x^2 + 2x  

+       (10x^2 + 6x + 9)

-----------------------------------

7x^3 +13x^2 +8x +9

gmany

Answer:

[tex]\large\boxed{A.\ 7x^3+13x^2+8x+9}[/tex]

Step-by-step explanation:

[tex](3x^2 + 2x + 7x^3) + (10x^2 + 6x + 9)\\\\=3x^2 + 2x + 7x^3 + 10x^2 + 6x + 9\qquad\text{combine like terms}\\\\=7x^3+(3x^2+10x^2)+(2x+6x)+9\\\\=7x^3+13x^2+8x+9[/tex]

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