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Unformatted text preview: ) = + 1 [Solution] y-2 y (e) 16 x - x 2 = 0 [Solution] Solution The important part here is to make sure that before we start using the quadratic formula that we have the equation in standard form first. © 2007 Paul Dawkins 97 College Algebra (a) x 2 + 2 x = 7 So, the first thing that we need to do here is to put the equation in standard form. x2 + 2 x - 7 = 0 At this point we can identify the values for use in the quadratic formula. For this equation we have. a =1 b=2 c = -7 Notice the “-” with c. It is important to make sure that we carry any minus signs along with the constants. At this point there really isn’t anything more to do other than plug into the formula. x= = -2 ± ( 2) 2 - 4 (1)( -7 ) 2 (1) -2 ± 32 2 There are the two solutions for this equation. There is also some simplification that we can do. We need to be careful however. One of the larger mistakes at this point is to “cancel” to 2’s in the numerator and denominator. Remember that...
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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.

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