Wednesday

April 16, 2014

April 16, 2014

Posted by **mkcolema** on Friday, March 13, 2009 at 8:56pm.

How do you find the one critical number??

- math-calc -
**GanonTEK**, Friday, March 13, 2009 at 9:15pmDifferentiate and put equal to zero.

f'[x] = 5e^(2x) + 2e^(2x)(-4+5x)

f'[0] = -3

So the x-coordinate is -3

I'd guess that that is what the question wants.

Hope that helps

- math-calc -
**GanonTEK**, Friday, March 13, 2009 at 9:23pmI made a slight error. i dont want f'[0], i want f'[x] = 0 to find x = something.

so we get 5e^(2x) + 2e^(2x)(-4+5x) = 0

divide across by e^(2x)

we get 5 + 2(-4+5x) = 0

5 - 8 + 10x =0

10x = 3

x = 3/10

Sorry about the mistake in my first post.

hope that helps

**Related Questions**

math-calc - f(x)=2x^3-36x^2+162x-6 small critical number? Large critical number?

Math33333 - Please help me! Problem: x+2 x-3 _________ - _________ 2x^2+5x+2 2x^...

Math - if f(x) = 2x^2 + 5x, find f(x+h) - f(x) / h and simplify. I started to ...

Pre-Calc - Could someone please check these-I had tried one last night but it ...

Calc - Can this be factored: 6/5x^1/5 - 12/5x^-4/5 I am trying to find the ...

Pre-Calc-Please check my answer-I think its correc - Could someone please check ...

calc - Find the critical number(s) of f(x)= abs(2x-4) What is the derivative of ...

bobPursley2...the other one - Problem 2: (x+2)/(2x^2+5x+2) - (x-3)/(2x^2-5x-3) ...

Pre-Calc-Please check my answer-I think I have it - Could someone please check ...

Pre-Calc-Please check my answer-I think I have it - Could someone please check ...