# Math Help - calculus

1. ## calculus

f(x)=x^2+7x+12

find the critical numbers

2. Originally Posted by sdaniels229
f(x)=x^2+7x+12

find the critical numbers
You want f'=0. Just solve for x then. Are you doing partial derivatives or just regular ones?

3. ## that's all the problem said

that's all the problem said was to find the critical number

4. To find the critical numbers, take the derivative of the function
And then find the value(s) for x

So take the derivative of:
$
f(x) = x^2 + 7x + 12
$

And then solve for x
This will give you the critical numbers of the function

5. Originally Posted by qzno
To find the critical numbers, take the derivative of the function
And then find the value(s) for x

So take the derivative of:
$
f(x) = x^2 + 7x + 12
$

And then solve for x
This will give you the critical numbers of the function
Critical numbers are the numbers that make the derivative zero and undefined.

6. Just solve $x^2+7x+12=0$

7. x is -3 or -4