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Provide an Appropriate Response T(x,y)=25x22xy+9y2\mathrm { T } ( \mathrm { x } , \mathrm { y } ) = 25 \mathrm { x } ^ { 2 } - 2 \mathrm { xy } + 9 \mathrm { y } ^ { 2 }

Question 48

Multiple Choice

Provide an appropriate response.
-Let T(x,y) =25x22xy+9y2\mathrm { T } ( \mathrm { x } , \mathrm { y } ) = 25 \mathrm { x } ^ { 2 } - 2 \mathrm { xy } + 9 \mathrm { y } ^ { 2 } be the temperature at the point (x,y) ( \mathrm { x } , \mathrm { y } ) on the ellipse x=3cost,y=5\mathrm { x } = 3 \cos \mathrm { t } , \mathrm { y } = 5 sin tt , 0t2π0 \leq t \leq 2 \pi . Find the minimum and maximum temperatures, Tmin\mathrm { T } _ { \mathrm { min } } and Tmax\mathrm { T } _ { \mathrm { max } } , respectively, on the ellipse.


A) Tmin=210;Tmax=240\mathrm { T } _ { \min } = 210 ; \mathrm { T } _ { \max } = 240
B) Tmin=435;Tmax=465\mathrm { T } _ { \min } = 435 ; \mathrm { T } _ { \max } = 465
C) Tmin=0;Tmax=30\mathrm { T } _ { \min } = 0 ; \mathrm { T } _ { \max } = 30
D) Tmin=π4;Tmax=3π4\mathrm { T } _ { \min } = \frac { \pi } { 4 } ; \mathrm { T } _ { \max } = \frac { 3 \pi } { 4 }

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