Your Algebra Homework Can Now Be Easier Than Ever!

Quadratic Functions and Models

We’ve learned what linear functions are and how they model perfectly linear or nearly linear data.
We now focus on working with nonlinear data ( curvilinear ), specifically quadratic functions.

Quadratic Function : f(x) = ax2 + bx + c represents a quadratic function, where a, b, and c are
real numbers with a ≠ 0. The domain of a quadratic function is all real numbers.

Vertex Form : Another way the quadratic function can be expressed:
f(x) = a ( x-h )2 + k (note: best form to use when modeling data)

• The graph is a parabola , a U-shaped graph that opens either upward or downward
• a is the leading coefficient → If a > 0, the graph opens upward, if a < 0, the graph opens
downward , also a controls the width of the parabola (narrow or wide)
• Vertex (h,k) → the highest point on a parabola that opens downward or the lowest point
that opens upward is called the vertex
• Axis of symmetry (x = h) → the vertical line passing through the vertex is called the axis of
symmetry
• Maximum or Minimum y- value on the graph (k)

Ex: 2x2 + 2x + 1

Identifying Quadratic Functions
In order to identify a function as “Quadratic Function”, you must be able to write in the form
f(x) = ax2 + bx + c {or f(x) = a ( x-h )2 + k }

Ex:

Converting from Quadratic Function Form to Vertex Form
You convert from quadratic function to vertex form by completing the square . If the quadratic
expression can be written as x2 + kx + (k / 2) 2 (i.e., a perfect square trinomial) and can be factored
as x2 + kx + (k / 2) 2 = (x + k / 2) 2

Ex:

Converting from Vertex Form to Quadratic Function Form
1. Square the binomial , 2. Distribute , 3. Add like terms
Ex:

Vertex Formula
The vertex of any parabola can be determined. The vertex of the graph of f(x) = ax2 + bx + c with
a ≠ 0 is the point ( - b / 2a , f( - b / 2a ) ).

Note → the vertex formula can be used to write a quadratic function in vertex form.
Ex:

Applications and Models
Exs:
 

Prev Next

Start solving your Algebra Problems in next 5 minutes!

Algebra Helper
Download (and optional CD)

Only $39.99

Click to Buy Now:


OR

2Checkout.com is an authorized reseller
of goods provided by Sofmath

Attention: We are currently running a special promotional offer for Algebra-Answer.com visitors -- if you order Algebra Helper by midnight of November 2nd you will pay only $39.99 instead of our regular price of $74.99 -- this is $35 in savings ! In order to take advantage of this offer, you need to order by clicking on one of the buttons on the left, not through our regular order page.

If you order now you will also receive 30 minute live session from tutor.com for a 1$!

You Will Learn Algebra Better - Guaranteed!

Just take a look how incredibly simple Algebra Helper is:

Step 1 : Enter your homework problem in an easy WYSIWYG (What you see is what you get) algebra editor:

Step 2 : Let Algebra Helper solve it:

Step 3 : Ask for an explanation for the steps you don't understand:



Algebra Helper can solve problems in all the following areas:

  • simplification of algebraic expressions (operations with polynomials (simplifying, degree, synthetic division...), exponential expressions, fractions and roots (radicals), absolute values)
  • factoring and expanding expressions
  • finding LCM and GCF
  • (simplifying, rationalizing complex denominators...)
  • solving linear, quadratic and many other equations and inequalities (including basic logarithmic and exponential equations)
  • solving a system of two and three linear equations (including Cramer's rule)
  • graphing curves (lines, parabolas, hyperbolas, circles, ellipses, equation and inequality solutions)
  • graphing general functions
  • operations with functions (composition, inverse, range, domain...)
  • simplifying logarithms
  • basic geometry and trigonometry (similarity, calculating trig functions, right triangle...)
  • arithmetic and other pre-algebra topics (ratios, proportions, measurements...)

ORDER NOW!

Algebra Helper
Download (and optional CD)

Only $39.99

Click to Buy Now:


OR

2Checkout.com is an authorized reseller
of goods provided by Sofmath
Check out our demo!
 
"It really helped me with my homework.  I was stuck on some problems and your software walked me step by step through the process..."
C. Sievert, KY
 
 
Sofmath
19179 Blanco #105-234
San Antonio, TX 78258
Phone: (512) 788-5675
Fax: (512) 519-1805
 

Home   : :   Features   : :   Demo   : :   FAQ   : :   Order

Copyright © 2004-2024, Algebra-Answer.Com.  All rights reserved.