Johnston, C. L.  1911- <br/><br/>
Essential algebra  
C.L. Johnston, Alden T. Willis, Jeanne Lazaris. 
 - 7th ed. 
 - Boston :  PWS,  1994. 
 - xv, 650, 99 p. ;  28 cm. 
 - The Johnston-Willis series .
 - Johnston, C. L.  1911-  Carol Lee),  Johnston/Willis developmental mathematics series. .
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0534944949 
<br/><br/><label>LCCN: </label>94011530  
<br/><br/><label>Subjects--Personal Names: </label>
<br/><br/><label>Subjects--Corporate Names: </label>
<br/><br/><label>Subjects--Uniform Titles: </label><br/>Quadratic equetion
<br/><br/><label>Subjects--Chronological Terms: </label>
<br/><br/><label>Subjects--Topical Terms: </label><br/>Algebra.