Question

simplify: $(3x^2 - x) + (2x^2 + 5x)$
\\(\text{a. } x^2 + 4x\\)
\\(\text{b. } 5x^2 + 4x\\)
\\(\text{c. } 6x^2 + 5x\\)
\\(\text{d. } 5x^2\\)

Explanation:

Step1: Remove parentheses

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

Step2: Combine like terms for $x^2$

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

Step3: Combine like terms for $x$

$-x + 5x = 4x$

Step4: Combine results

$5x^2 + 4x$

Answer:

b. $5x^2 + 4x$