5ab²-[2a²b-(4ab²-2a²b)]
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5ab²-[2a²b-(4ab²-2a²b)]5ab²-[2a²b-(4ab²-2a²b)]5ab²-[2a&
5ab²-[2a²b-(4ab²-2a²b)]
5ab²-[2a²b-(4ab²-2a²b)]
5ab²-[2a²b-(4ab²-2a²b)]
5ab²-[2a²b-4ab²+2a²b]
=5ab²-2a²b+4ab²-2a²b
=9ab²-2a²b
5ab²-[2a²b-(4ab²-2a²b)] =5ab²-(2a²b-4ab²+2a²b)=5ab²-2a²b+4ab²-2a²b=9ab²-4a²b