Question

I have no clue how to go about this question:
In your lab, a substance's temperature has been observed to follow the function T(x) = (x + 5)^3 + 7. The turning point of the graph is where the substance changes from a liquid to a solid. Using complete sentences in your written answer, explain to your fellow scientists how to find the turning point of this function. Hint: The turning point of the graph is similar to the vertex of a quadratic function.
I know it's in vertex form, but it has the ^3 instead of ^2, and I'm not sure if that changes it or not.

Answer 1

Please explain it too, thanks

Answer 2

@mathmale