Question

1. simplify: $(3x^2 - x) + (2x^2 + 5x)$

a. $x^2 + 4x$
b. $5x^2 + 4x$
c. $5x^2$
d. $6x^2 + 5x$

Explanation:

Step1: Remove parentheses

$3x^2 - x + 2x^2 + 5x$

Step2: Combine like $x^2$ terms

$3x^2 + 2x^2 = 5x^2$

Step3: Combine like $x$ terms

$-x + 5x = 4x$

Step4: Combine results

$5x^2 + 4x$

Answer:

b. $5x^2 + 4x$