Question

help

Answer 1

@3mar

Answer 2

Critical point of f is when f'(x)=0 or f'(x) is undefined

Answer 3

@sunnnystrong it is A, right?

Answer 4

http://tutorial.math.lamar.edu/Classes/CalcI/CriticalPoints.aspx

Answer 5

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

Answer 6

After taking the derivative and factoring... set each factor equal to zero and solve for x.


Since it is a polynomial... the domain is all real numbers

Answer 7

Nice presentation, @sunnnystrong !
Thank you for good explanation.

Answer 8

@sunnnystrong is it A or not all i want to know.

Answer 9

Once you find the critical point...
(x=2)

what is f(2)? plug into original function and find critical point

Answer 10

@3mar oh goshh thank you :3

Answer 11

@iwanttogotostanford i'm sure you can figure it out :)

Answer 12

Not at all!
You deserve it!

You are aware of how to be in the middle of the battle!