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I'm pretty sure d) is supposed to be 3a^2 - 3b^2. Where have I gone wrong?

I'm pretty sure d) is supposed to be 3a^2 - 3b^2. Where have I gone wrong?
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I'm pretty sure d) is supposed to be 3a^2 - 3b^2. Where have I gone wrong?

I'm pretty sure d) is supposed to be 3a^2 - 3b^2. Where have I gone wrong?-example-1
User Wkschwartz
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1 Answer

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(2a+b)^2-(a+2b)^2 \\ (4a^2+4ab+b^2)-(a^2+4ab+4b^2) \\ (4a^2+4ab+b2-a^2-4ab-4b^2) \\ (3a^2-3b^2) Final Answer
User Corbin
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