The value of \[9{{x}^{2}}+49{{y}^{2}}-42xy\] when \[x=15\]and \[y=3\]is ____.

The value of \[9{{x}^{2}}+49{{y}^{2}}-42xy\] when \[x=15\]and \[y=3\]i

1.	The value of \[9{{x}^{2}}+49{{y}^{2}}-42xy\] when \[x=15\]and \[y=3\]is ____.
A.	636
B.	576
C.	456
D.	386
Answer» C. 456

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The value of \[9{{x}^{2}}+49{{y}^{2}}-42xy\] when \[x=15\]and \[y=3\]is ____.

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