Question

4a. $(6x^{2}+3x+1)+(2x^{2}+5x+4)$

Explanation:

Step1: Group like terms

$(6x^2 + 2x^2) + (3x + 5x) + (1 + 4)$

Step2: Combine like terms

$8x^2 + 8x + 5$

Answer:

$8x^2 + 8x + 5$