Posted by john on Tuesday, September 13, 2011 at 11:11am.
[-9 -sqrt(-3)]^2
let me change that to i notation (i=sqrt-1)
[-9- i sqrt3]^2
Using FOIL
81+9isqsrt3 +9isqrt3+i^2*3
81+18i*sqrt3 -3
78+18i*sqrt3
remember i^2=-1
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