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4 years ago

Please help!!!

Mathematics

2 answers:

S_A_V [24]4 years ago

7 0

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

Nataliya [291]4 years ago

7 0

Answer:

$\large\boxed{A.\ 7x^3+13x^2+8x+9}$

Step-by-step explanation:

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

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