@ �bereil I havn�t understand your answer completly. So I�am sorry if you had meant this.

But I have counted it now


if a = 2 then b = 2 right?`Ok

the the equation�s must call

2 = 2
2� = 2*2
2�-2� = 2*2-2�
(2+2)*(2-2)=2*(2-2)

so long the equalation ist right

but (2+2)*(2-2)=2*(2-2) is NOT (2+2)=2

separate it is 2�-2�=2*2-2*2

or in formulas
(a+b)*(a-b) = b*(a-b) = a�-b� = a*b-2*b <img src="/ubbthreads/images/graemlins/wave.gif" alt="" />


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