A quadratic function is given. please help

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A quadratic function is given.
f(x) = −x2 − 3x + 3
(a) Express the quadratic function in standard form.

(c) Find its maximum or minimum value. 

f(x) =
Jul 8th, 2015

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The standard form of a quadratic function is

where (h, k) is the vertex of the parabola.

f(x) can be expressed in standard form by completing the square.

First make the coefficient of x^2 1 by taking -1 common

Take half of coefficient of x which gives 3/2

and square it which gives (3/2)^2 = 9/4

Add and subtract 9/4 from the equation inside the bracket.

This is the standard form of the quadratic function.

Since a = -1 < 0, the parabola opens downwards.

Hence the vertex is the highest point on the parabola.

Vertex = (h, k) = (-3/2, 21/4)

So, maximum value = 21/4



b) Maximum value is f(x) = 21/4  


Please let me know if you need any clarification. I'm always happy to answer your questions.
Jul 8th, 2015

Jul 8th, 2015
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