Quiz8solutions - MAC1105: Quiz #8 Solutions July 12, 2010...

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Unformatted text preview: MAC1105: Quiz #8 Solutions July 12, 2010 In the top-right corner of a clean sheet of paper, write your name, UFID, and section number. Please use a pen with blue or black ink. When you are nished, FOLD your paper in half lengthwise and write your name on the back. 1. Suppose a classmate is asking you for help with some problems, and they want you to check their work, shown below. In each problem, state whether their work correct. If not, state exactly where their error is (there may be more than one, or none at all), and x it. ( x- 3) 2 x + 3 x- 2 x 2- 4 = x 2- 3 2 x + 3 x- 2 ( x + 2)( x- 2) = ( x + 3)( x- 3) x + 3 x- 2 ( x + 2)( x- 2) = x- 3 x + 2 Here the student has committed the error of writing ( a- b ) 2 = a 2- b 2 , when in fact ( a- b ) 2 = a 2- 2 ab + b 2 . In the second step, the student should have written x 2- 6 x + 9 . 2. Same directions as (1): q ( 1 3 ) 3 x 4 y 2 p 4 xy 3 = s ( 1 9 ) x 4 y 5 4 xy 3 = r 1 36 x 3 y 2 = 1 6 x 2 x p y 2 = 1 6 xy x Here, two errors have occured. In the rst step, the student has writtenHere, two errors have occured....
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Quiz8solutions - MAC1105: Quiz #8 Solutions July 12, 2010...

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