Question

second derivative of -x³​

Answer 1

Answer:

For an example of finding and using the second derivative of a function, take f(x)=3x3 − 6x2 + 2x − 1 as above. Then f (x)=9x2 − 12x + 2, and f (x) = 18x − 12. So at x = 0, the second derivative of f(x) is −12, so we know that the graph of f(x) is concave down at x = 0.