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variables

Expert replies
Source: — Problem Solving |

by DanaJ » Mon Feb 16, 2009 6:08 am
I'm going to assume that you mean x = sqrt(4xy - 4y^2). Raise to the second power and you get that:
x^2 = 4xy - 4y^2. Now "send" everything to the left and you get:
x^2 - 4xy + 4y^2 = 0. This one is equivalent to (x - 2y)^2 = 0 or that x - 2y = 0. This makes x = 2y with answer A.
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