Q: If $$ {x^{4}+x^{2}y^{2}+y^{4}={21\over256}}$$ and $$ {x^{2}+xy+y^{2 – McqOptions

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1.	Q: If $$ {x^{4}+x^{2}y^{2}+y^{4}={21\over256}}$$ and $$ {x^{2}+xy+y^{2}={3\over16}}$$ then $$ {2(x^{2}+y^{2})}=?$$
A.	$$ {3\over 8}$$
B.	$$ {5\over 8}$$
C.	$$ {3\over 4}$$
D.	$$ {5\over 16 }$$
Answer» C. $$ {3\over 4}$$

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