rmamissah wrote:
Bunuel wrote:
What is the value of x - y?
(1) (x + y)^2 = 4xy -->\(x^2+2xy+y^2=4xy\) -->\(x^2-2xy+y^2=0\) -->\((x-y)^2=0\) -->\(x-y=0\) . Sufficient.
(2) x^2 - y^2 = 0 --> \((x-y)(x+y)=0\) -->\(x-y=0\) or\(x+y=0\) . Not sufficient.
Answer: A.
Hope it's clear.
(1) (x + y)^2 = 4xy -->\(x^2+2xy+y^2=4xy\) -->\(x^2-2xy+y^2=0\) -->\((x-y)^2=0\) -->\(x-y=0\) . Sufficient.
(2) x^2 - y^2 = 0 --> \((x-y)(x+y)=0\) -->\(x-y=0\) or\(x+y=0\) . Not sufficient.
Answer: A.
Hope it's clear.
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