Question

1. $(7x^{2}+6x)-(-3x^{2}+3)$

Explanation:

Step1: Distribute the negative sign

$7x^2 + 6x + 3x^2 - 3$

Step2: Combine like $x^2$ terms

$7x^2 + 3x^2 = 10x^2$

Step3: Write simplified expression

$10x^2 + 6x - 3$

Answer:

$10x^2 + 6x - 3$