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Answer:
Maximum: ((1,-2,5) ; 30)
Minimum: ((-1,2,-5) ; -30)
Step-by-step explanation:
We have the function f(x,y,z) = x - 2y + 5z, with the constraint g(x,y,z) = 30, with g(x,y,z) = x²+y²+z². The Lagrange multipliers Theorem states that, the points (xo,yo,zo) of the sphere where the function takes its extreme values should satisfy this equation:
grad(f) (xo,yo,zo) = λ * grad(g) (xo,yo,zo)
for a certain real number λ. The gradient of f evaluated on a point (x,y,z) has in its coordinates the values of the partial derivates of f evaluated on (x,y,z). The partial derivates can be calculated by taking the derivate of the function by the respective variable, treating the other variables as if they were constants.
Thus, for example, fx (x,y,z) = d/dx x-2y+5z = 1, because we treat -2y and 5z as constant expressions, and the partial derivate on those terms is therefore 0. We calculate the partial derivates of both f and g
- fx(x,y,z) = 1
- fy(x,y,z) = -2
- fz(x,y,z) = 5
- gx(x,y,z) = 2x (remember that y² and z² are treated as constants)
- gy(x,y,z) = 2y
- gz(x,y,z) = 2z
Thus, for a critical point (x,y,z) we have this restrictions:
- 1 = λ 2x
- -2 = λ 2y
- 5 = λ 2z
- x²+y²+z² = 30
The last equation is just the constraint given by g, that (x,y,z) should verify.
We can put every variable in function of λ, and we obtain the following equations.
- x = 1/2λ
- y = -2/2λ = -1/λ
- z = 5/2λ
Now, we replace those values with the constraint, obtaining
(1/2λ)² + (-1/λ)²+(5/2λ)² = 30
Developing the squares and taking 1/λ² as common factor, we obtain
(1/λ²) * (1/4 + 1 + 25/4) = (1/λ²) * 30/4 = 30
Hence, λ² = 1/4, or, equivalently,
If then 1/λ is 2, and therefore
- x = 1
- y = -2
- z = 5
and f(x,y,z) = f(1,-2,5) = 1 -2 * (-2) + 5*5 = 30
If then 1/λ is -2, and we have
- x = -1
- y = 2
- z = -5
and f(x,y,z) = f(-1,2,-5) = -1 -2*2 + 5*(-5) = -30.
Since the extreme values can be reached only within those two points, we conclude that the maximun value of f in the sphere takes place on ((1,-2,5) ; 30), and the minimun value takes place on ((-1,2,-5) ; -30).
Answer:
C. 5
Step-by-step explanation:
Point R divides the line segment PQ internally. The x-coordinate of the point which divides the line segment in ration m:n internally can be calculated as:
Here, x1 is the x-coordinate of 1st point, x2 is the x-coordinate of 2nd point, x is the x-coordinate of point dividing the segment. We have all the values except x2. Using the given values in above formula, we get:
Thus the x-coordinate of point Q will be 5
The x-coordinate of Q is 5.
63 x 4 = 2x2=3 - 17? Simplified form of this expression: The chosen topic is not meant for use with this type of problem.
So instead I will simplify the matrix, if you simply the matrix, the ANSWER will be: 252 = 2x^2 = -14
So instead I will simplify the matrix, if you simply the matrix, the ANSWER will be: 252 = 2x^2 = -14