Question

subtract.
(9r² + 2r + 9) - (8r² + 2r + 4)

Explanation:

Step1: Distribute the negative sign

$(9r^2 + 2r + 9) - (8r^2 + 2r + 4) = 9r^2 + 2r + 9 - 8r^2 - 2r - 4$

Step2: Combine like terms

For $r^2$ terms: $9r^2 - 8r^2 = r^2$
For $r$ terms: $2r - 2r = 0$
For constant terms: $9 - 4 = 5$

Step3: Combine results

$r^2 + 0 + 5 = r^2 + 5$

Answer:

$r^2 + 5$