Give in form a+b√2 (3-√8)² 9-3√8-3√8+4 13-6√8 13-12√2 book says i'm wrong can't understand why
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Originally Posted by alibond07 Give in form a+b√2 (3-√8)² 9-3√8-3√8+4 e^(i*pi): Where did +4 come from? $\displaystyle (-\sqrt8)^2 = 8$ 13-6√8 13-12√2 book says i'm wrong can't understand why $\displaystyle (3-\sqrt8)^2 = 9-6\sqrt8+8 = 17-6\sqrt8 = 17-12\sqrt2$
Thanks got it now, just made a careless mistake with the -√8x-√8.
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