Pre-Calculus - Finding the maximum or minimum of a function

[cesiameza]

Best explanation, THAT I've found so far!! thank u!!

[isabellac]

this helped a whole lot! you explained it in 7 mins and my teacher takes about 1hr to do what you just did! shes so confusing ! THANKS SO MUCH!

[steve-scofield]

For the second problem, did you mean MAX or MIN because I thought from the onset it was clear we are looking for a max. Thanks anyway, you are the best.

[jolieobi]

Really helpful. Thanks. Also thot you meant max was 3312.75

[gohan]

It’s so much more easier to find the max and min of a function after you learn some calculus...

1) get the derivative of the function with respect to x... in the first example the derivative of the function
7.5x^2 - 63x + 99 is 15x - 63

Set the derivative of the function equal to zero and solve for x... 15x - 63 = 0 —> solving for x gives you 63/15

[Melbester]

Thanks for the video man. My professor doesn't explain it simple like you do. Greatly appreciate it!

[noice]

Best explanation. Clear and straight forward

[jasonparkinson]

Simple explanation= fully understood. Thanks.

[timothymcbearington]

thanks! very easy to understand great videos i love them.. but what about over an interval such as (-2, 3]?

[ayeshasiddiqui]

Sir for the second problem it is a max value, by mistake you wrote it as min value.

[angelikastefoglo]

You’ve been a grade saver, thanks so much!!!🙏🙏👌

[emcskills]

This was a fantastic video, thanks for the help!

[arsildarouiche]

Thank you so much, this helped a lot!
I have a question, what if my a value was 0?
How would I find the min/max?

[humababar]

if points are given then how to solve it

[rachelcrawford]

what do you do if the quadratic function is already factored

[stevenboxleitner]

You sound exactly like my precalc teacher Mr. Kish XD