Posted by **Niki** on Saturday, October 13, 2007 at 11:58pm.

I dont understand how to find the maximum and minimum.

Determine whether the given quadratic function has a minimum value or maximum value. Then find the coordinates of the minimum or maximum point.

15.f(x) = -x2 + 2x - 4

20.f(x) = 2x2 - 4x

19.f(x) = x2 - 2x + 1

30.f(x) = -3x2 - 3x

- Algebra- Maximum and minimum. -
**Reiny**, Sunday, October 14, 2007 at 1:29am
#15 and #30 open downwards, so they have a maximum

#20 and #19 open upwards, so they have a minimum.

change the equations to the form

f(x) = a(x-h)^2 + k by completing the square

You should have learned how to do this, and read the vertex from that form.

- Algebra- Maximum and minimum. -
**jones**, Saturday, August 20, 2011 at 2:56am
what are the maximum value and minimum value of (x)=12sin(2x-2pi/3)-5l+3

- Algebra- Maximum and minimum. -
**butt face**, Monday, November 28, 2011 at 6:09pm
2x2- 16x+4= i do not know

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