add. (3r² + 3r + 4) + (2r² + 2r + 3)

Explanation:

Step1: Combine like - terms of $r^2$

$(3r^{2}+2r^{2})+(3r + 2r)+(4 + 3)$

Step2: Simplify the $r^2$ terms

$5r^{2}+(3r + 2r)+(4 + 3)$

Step3: Simplify the $r$ terms

$5r^{2}+5r+(4 + 3)$

Step4: Simplify the constant terms

$5r^{2}+5r + 7$

Answer:

$5r^{2}+5r + 7$