a = b a*a = b*a a*a - b*b = b*a - b*b (a-b)*(a+b) = b(a-b) a+b = b b+b = b 2b = b 2 = 1 Hint:

a = b
a*a = b*a
a*a - b*b = b*a - b*b
(a-b)*(a+b) = b(a-b)
a+b = b
b+b = b
2b = b
2 = 1
Hint: whatever number, multiplied by 0 gives 0...
-- Antonio

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