Practice Problems for Exam 2 (Solutions) 1 Use Lagrange Multipliers to find the global maximum and minimum values of ( ) = 2 + 22 4 subject to the constraint
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[PDF] Practice Problems for Exam 2 (Solutions) 1 Use Lagrange
Practice Problems for Exam 2 (Solutions) 1 Use Lagrange Multipliers to find the global maximum and minimum values of ( ) = 2 + 22 4 subject to the constraint
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PracticeProblemsforExam2(Solutions)
x2+2y24ysubjecttotheconstraintx2+y2=9.
g(x;y)=ktondthecriticalpoints: 2x=2x4y4=2y
x2+y2=9:
5.Thus,there
arefourcriticalpoints:(0;3)and(p5;2).Evaluatingf(x;y)atthesepoints
gives:f(0;3)=6,f(0;3)=30,f(p5;2)=5=F(p5;2).Therefore,theglobal
atthetwopoints(p5;2).J
2.Compute
2 0 2y y2(4xy)dxdy.
ISolution.
2 0 2y y2(4xy)dxdy=
2 0 (2x2xy) x=2y x=y2dy 2 0 (6y22y4+y3)dy=2y32y5
5+y44 2 0 =16645+4=365:
J3.Compute
1 0 x 0 xy 0 xyzdzdydx.ISolution.
1 0 x 0 xy 0 xyzdzdydx= 1 0 x 0xyz2 2 z=xy z=0dydx 1 0 x 0x 3y32dydx=
1 0x 3y48 y=x y=0dx 1 0x 77dx=x864
1 0=1 64:J