Question

add.
$(-4f^2 + 9) + (5f^3 + 6f^2 - 6f - 4)$

Explanation:

Step1: Remove parentheses

\((-4f^2 + 9) + (5f^3 + 6f^2 - 6f - 4)=-4f^2 + 9 + 5f^3 + 6f^2 - 6f - 4\)

Step2: Combine like terms

For \(f^2\) terms: \(-4f^2+6f^2 = 2f^2\)
For constant terms: \(9 - 4=5\)
So the expression becomes \(5f^3+2f^2 - 6f+5\)

Answer:

\(5f^3 + 2f^2 - 6f + 5\)