If \[P\equiv (x,\ y)\], \[{{F}_{1}}\equiv (3,\ 0)\], \[{{F}_{2}}\equiv (-3,\ 0)\] and \[16{{x}^{2}}+25{{y}^{2}}=400\], then \[P{{F}_{1}}+P{{F}_{2}}\] equals [IIT 1998]

If \[P\equiv (x,\ y)\], \[{{F}_{1}}\equiv (3,\ 0)\], \[{{F}_{2}}\equiv

1.	If \[P\equiv (x,\ y)\], \[{{F}_{1}}\equiv (3,\ 0)\], \[{{F}_{2}}\equiv (-3,\ 0)\] and \[16{{x}^{2}}+25{{y}^{2}}=400\], then \[P{{F}_{1}}+P{{F}_{2}}\] equals [IIT 1998]
A.	8
B.	6
C.	10
D.	12
Answer» D. 12

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If \[P\equiv (x,\ y)\], \[{{F}_{1}}\equiv (3,\ 0)\], \[{{F}_{2}}\equiv (-3,\ 0)\] and \[16{{x}^{2}}+25{{y}^{2}}=400\], then \[P{{F}_{1}}+P{{F}_{2}}\] equals [IIT 1998]

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