Question

perform the following additions and/or subtractions:
$(9a^2 - 4a - 1) - (-9a^2 + 4a + 1) = $
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Explanation:

Step1: Distribute the negative sign

$9a^2 - 4a - 1 + 9a^2 - 4a - 1$

Step2: Combine like $a^2$ terms

$9a^2 + 9a^2 = 18a^2$

Step3: Combine like $a$ terms

$-4a - 4a = -8a$

Step4: Combine constant terms

$-1 - 1 = -2$

Step5: Combine all results

$18a^2 - 8a - 2$

Answer:

$18a^2 - 8a - 2$