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Intermediate Algebra – Student Workbook – Second Edition 2013

Intermediate Algebra – Student Workbook – Second Edition 2013

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Name: _____________________<br />

Date: ________________<br />

Mini-Lesson 5b<br />

Number and Types of Solutions to Quadratic Equations in Standard Form<br />

There are three possible cases for the number of solutions to a quadratic equation in standard<br />

form.<br />

Note that Standard Form just means the equation is set = 0 (see next page for more formal<br />

definition).<br />

CASE 1:<br />

Parabola: Touches the x-axis in just one<br />

location (i.e. only the vertex touches the x-axis)<br />

One, repeated, real number solution<br />

Example: (x - 2) 2 = 0<br />

CASE 2:<br />

Parabola: Crosses the x-axis in two unique<br />

locations.<br />

Two, unique, real number solutions<br />

Example: x 2 <strong>–</strong> 4x <strong>–</strong> 5 = 0<br />

CASE 3:<br />

Parabola: Does NOT cross the x-axis<br />

No real number solutions but two, complex<br />

number solutions (explained later in the lesson)<br />

Example: 2x 2 + x + 1 = 0<br />

REMINDER: A QUADRATIC FUNCTION is a function of the form<br />

f(x) = ax 2 +bx+c<br />

A QUADRATIC EQUATION in STANDARD FORM is an equation of the form<br />

ax 2 +bx+c = 0<br />

Scottsdale Community College Page 209 <strong>Intermediate</strong> <strong>Algebra</strong>

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