Question

what is the sum of the polynomials?
$(m + n + 3) + (m + n + 4)$
$\bigcirc -1$
$\bigcirc m^2 + n^2 + 7$
$\bigcirc 2m + 2n + 7$
$\bigcirc 2m^2 + 2n^2 + 7$

Explanation:

Step1: Remove parentheses

$m + n + 3 + m + n + 4$

Step2: Combine like terms for $m$

$m + m = 2m$

Step3: Combine like terms for $n$

$n + n = 2n$

Step4: Combine constant terms

$3 + 4 = 7$

Step5: Combine all results

$2m + 2n + 7$

Answer:

2m + 2n + 7 (Option C)