3a²-[5a-(1∕2a-3)+2a²]+4
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3a²-[5a-(1∕2a-3)+2a²]+4
3a²-[5a-(1∕2a-3)+2a²]+4
3a²-[5a-(1∕2a-3)+2a²]+4
=3a²-5a+1/2a-3-2a²+4
=a²-9/2a+1
3a²-[5a-(1∕2a-3)+2a²]+4
3a²-[5a-(1∕2a-3)+2a²]+4
3a²-[5a-(1∕2a-3)+2a²]+4
=3a²-5a+1/2a-3-2a²+4
=a²-9/2a+1