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2010-02-24T12:46:46+01:00
(2a+1)(2a-1)+1/2(a-3)²+1/2(7-5a)-√20i1/4=
4a²-2a+2a-1+1/2(a²-6+9)+7/2-5/2a-√25/4=
4a²-1+1/2a²-3+9/2+7/2-5/2a-5/2=
=4i1/2a²-2i1/2a+1i1/2

a=1/2
=9/2*(1/2)²-5/2*(1/2)+1i1/2=
9/8-5/4+1i1/2=
9/8-10/8+1i4/8=
-1/8+1i4/8=
=1i3/8