Question

add.
$(f^{2} + 5) + (8f^{3} + 9f^{2} + f)$

Explanation:

Step1: Remove parentheses

$f^2 + 5 + 8f^3 + 9f^2 + f$

Step2: Group like terms

$8f^3 + (f^2 + 9f^2) + f + 5$

Step3: Combine like terms

$8f^3 + 10f^2 + f + 5$

Answer:

$8f^3 + 10f^2 + f + 5$