Question

1. $(x^{2}+5)+(7x^{2}+3)$

Explanation:

Step1: Remove parentheses

$x^2 + 5 + 7x^2 + 3$

Step2: Combine like $x^2$ terms

$x^2 + 7x^2 = 8x^2$

Step3: Combine constant terms

$5 + 3 = 8$

Step4: Combine results

$8x^2 + 8$

Answer:

$8x^2 + 8$