(3a²-b²)-3(a²-2b²)

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(3a²-b²)-3(a²-2b²)(3a²-b²)-3(a²-2b²)(3a²-b²)-3(a&#

(3a²-b²)-3(a²-2b²)
(3a²-b²)-3(a²-2b²)

(3a²-b²)-3(a²-2b²)
(3a²-b²)-3(a²-2b²)=(3a²-3a²)+(-b²+6b²)=5b²

5b²