if x2+y2=26 and xy =3 find the value of
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Given: .
Question: So, basically we should find the value of
(1) xy = 10. Directly gives us the value we needed. Sufficient.
(2) x = 5. Now even if we substitute the value of in we'll get two values for : 2 and -2, hence two values for : 9 and 49. Not sufficient.
Answer: A.
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