Question

1. (01.04 lc) simplify $(7x^2 - 2x + 9) + (3x^2 + 15x - 4)$. (5 points) $\bigcirc$ $10x^2 + 13x + 5$ $\bigcirc$ $10x^2 - 13x - 5$ $\bigcirc$ $10x^2 + 17x + 13$ $\bigcirc$ $10x^2 - 17x - 13$

Explanation:

Step1: Remove parentheses

$7x^2 - 2x + 9 + 3x^2 + 15x - 4$

Step2: Combine $x^2$ terms

$7x^2 + 3x^2 = 10x^2$

Step3: Combine $x$ terms

$-2x + 15x = 13x$

Step4: Combine constant terms

$9 - 4 = 5$

Step5: Combine all simplified terms

$10x^2 + 13x + 5$

Answer:

A. $10x^2 + 13x + 5$