17. For what value of x is the graph of y = 2 / (4 - x) concave downwards? I found the first derivative = 2/(4-x)^2 And then the second 4/(4-x)^3 But I think I might have messed up somewhere in there
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Originally Posted by karisrou 17. For what value of x is the graph of y = 2 / (4 - x) concave downwards? I found the first derivative = 2/(4-x)^2 And then the second 4/(4-x)^3 But I think I might have messed up somewhere in there Concave down for values of x satisfying f''(x) < 0. In your case this happens for x > 4. (This is evident from the graph).
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