Question

subtract.
$(-9n^{2}-7n)-(-9n^{2}-9n-2)$

Explanation:

Step1: Distribute the negative sign

$(-9n^2 - 7n) + 9n^2 + 9n + 2$

Step2: Combine like $n^2$ terms

$-9n^2 + 9n^2 = 0$

Step3: Combine like $n$ terms

$-7n + 9n = 2n$

Step4: Isolate constant term

$+2$

Step5: Combine all simplified terms

$2n + 2$

Answer:

$2n + 2$