08-July-2008, 04:42 AM
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Senior Member
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Join Date: Jul 2008
Posts: 130
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Quote:
Originally Posted by alainprice
p.s. if X = AB, then X^2 is not equal to A^2*B^2.
X^2 = (AB)^2
This is a classic mistake. It's like saying the sqrt(A+B) = sqrt(A) + sqrt(B)
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x=ab then
x^2 = (A*B)^2
= (A*B)*(A*B)
= A*A*B*B
= (A*A)*(B*B)
= (A^2)*(B^2)
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