First the standard form of a quadratic equation is ax

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 5aR ) = m Finally, divide by the coefficient of b. Recall as well that the “coefficient” is all the stuff that multiplies the b. Doing this gives, b= Example 4 Solve m V + 5aR 111 = + for c. abc Solution First, multiply by the LCD, which is abc for this problem. 1 11 ( abc ) = æ + ö ( abc ) ç ÷ a èb cø bc = ac + ab Next, collect all the c’s on one side (the right will probably be easiest here), factor a c out of the terms and divide by the coefficient. bc - ac = ab c ( b - a ) = ab c= © 2007 Paul Dawkins 83 ab b-a College Algebra Example 5 Solve y = 4 for x. 5x - 9 Solution First, we’ll need to clear the denominator. To do this we will multiply both sides by 5 x - 9 . We’ll also clear out any parenthesis in the problem after we do the multiplication. y ( 5x - 9 ) = 4 5 xy - 9 y = 4 Now, we want to solve for x so that means that we need to get all terms without a y in them to the other side. So add 9y to both sides and the divide by the coefficient of x. 5 xy = 9 y + 4 9y + 4 x= 5y Example 6 Solve y = 4 - 3x for x. 1 + 8x Soluti...
View Full Document

This note was uploaded on 06/06/2012 for the course ICT 4 taught by Professor Mrvinh during the Spring '12 term at Hanoi University of Technology.

Ask a homework question - tutors are online