Quote:
Originally Posted by Odysseus
(a - b)^2 = (a - b)*(a - b) = a*a - a*b - b*a + b*b = a^2 - a*b - a*b + b^2 = a^2 - 2a*b + b^2
a^2 - 2*a*b + b^2 = (a - b)^2
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I got this when I tried that :
(a - b)^2 = (a - b)*(a - b) = a(a - b) - b(a - b) = (a^2 - ab) - (ab - b^2) = a^2 - 2ab
- b^2