Question: the function h(x)=ln(x 2 +c) is concave up on the interval (-4,4) and concave down on the intervals (4, infinity) and (-infinity, -4). what is

the function h(x)=ln(x2+c) is concave up on the interval (-4,4) and concave down on the intervals (4, infinity) and (-infinity, -4).

what is the value of constant "c"?

it should be an integer or a simplified fraction

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