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Unformatted text preview: iscriminant is positive we will get two real distinct solutions. Here they are, x= -20 ± 472 -10 ± 118 = 12 6 [Return to Problems] (c) 49t 2 + 126t + 81 = 0 This equation is already in standard form so let’s jump straight in. a = 49 b = 126 c = 81 The discriminant is then, b 2 - 4ac = (126 ) - 4 ( 49 )( 81) = 0 2 In this case we’ll get a double root since the discriminant is zero. Here it is, x=- 9 7 [Return to Problems] For practice you should verify the solutions in each of these examples. © 2007 Paul Dawkins 106 College Algebra Application of Quadratic Equations In this section we’re going to go back and revisit some of the applications that we saw in the Linear Applications section and see some examples that will require us to solve a quadratic equation to get the answer. Note that the solutions in these cases will almost always require the quadratic formula so expect to use it and don’t get excited about it. Also, we are going to assum...
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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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