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Let 
g be a twice differentiable function, and let 
g(4)=-2, 
g^(')(4)=0, and 
g^('')(4)=6.
What occurs in the graph of 
g at the point 
(4,-2) ?
Choose 1 answer:
(A) 
(4,-2) is a minimum point.
(B) 
(4,-2) is a maximum point.
(C) There's not enough information to tell.

Let g g be a twice differentiable function, and let g(4)=2 g(4)=-2 , g(4)=0 g^{\prime}(4)=0 , and g(4)=6 g^{\prime \prime}(4)=6 .\newlineWhat occurs in the graph of g g at the point (4,2) (4,-2) ?\newlineChoose 11 answer:\newline(A) (4,2) (4,-2) is a minimum point.\newline(B) (4,2) (4,-2) is a maximum point.\newline(C) There's not enough information to tell.

Full solution

Q. Let g g be a twice differentiable function, and let g(4)=2 g(4)=-2 , g(4)=0 g^{\prime}(4)=0 , and g(4)=6 g^{\prime \prime}(4)=6 .\newlineWhat occurs in the graph of g g at the point (4,2) (4,-2) ?\newlineChoose 11 answer:\newline(A) (4,2) (4,-2) is a minimum point.\newline(B) (4,2) (4,-2) is a maximum point.\newline(C) There's not enough information to tell.
  1. Given Information: We are given that gg is a twice differentiable function, and we have the following information about gg and its derivatives at x=4x = 4:
    - g(4)=2g(4) = -2
    - g(4)=0g'(4) = 0
    - g(4)=6g''(4) = 6

    The value of g(4)=2g(4) = -2 tells us the yy-coordinate of the point on the graph of gg at x=4x = 4. The value of g(4)=0g'(4) = 0 tells us that the slope of the tangent to the graph of gg at x=4x = 4 is zero, which means the graph has a horizontal tangent line at this point. This could indicate a local maximum, a local minimum, or a point of inflection.

    The value of g(4)=6g''(4) = 6 tells us the concavity of the graph at x=4x = 4. Since gg55 is positive, the graph of gg is concave up at x=4x = 4. This means that the point gg88 is a local minimum because the graph is shaped like a "U" around this point.

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