Talk:A-level Mathematics/Edexcel/Further 1/Complex Numbers

i am no good at editing so i cant fix this my self: It is tempting to leave the solution as one would when multiplying unknowns. However, the value of is known to be -1. So: http://upload.wikimedia.org/math/d/9/b/d9b3664f1fc57b5665952906101f0cc1.png

(z^2)=9+((6*(2)^.5)i)+2(i^2) (z^2)=9+((6*(1)^.5)) +2*(-1) (z^2)=9-2+((6*(2)^.5))= 7+((6*(2)^.5))

this is incorrect because[((6*(2)^.5)i) is not equal to ((6*(1)^.5))nor does it equals((6*(2)^.5))]

what should be in place is:

(z^2)=9+((6*(2)^.5)i)+2(i^2) (z^2)=9+((6*(2)^.5)i) +2*(-1) (z^2)=9-2+((6*(2)^.5)i)= 7+((6*(2)^.5)i)

thanks for reading hope you will fix this soon