Question

find the absolute maximum and minimum f(x)=x^2+4x; on [-5,5]

Answer 1

Did you find the vertex of this parabola?

Answer 2

no.. I thought you just had to find the derivative and then plug in for x...

Answer 3

I guess it depends on what chapter you are studying.

Answer 4

haha can you help? :)

Answer 5

The x coordinate of the vertex is -b/2a. It is in the given interval?

Answer 6

yeah check out my screen shot of the problem

Answer 7

So, to find the minimum, plug the x coordinate of the vertex into the equation and find the y coordinate. That will be the absolute minimum of the parabola and thus the absolute minimum in the prescribed interval.

Answer 8

yeah i got 16 for the max and -6 for the min but it says its wrong....