Quiz12solutions - MAC1105 Quiz#12 Solutions In the top-right corner of a clean sheet of paper write your name UFID and section number Please use a

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Unformatted text preview: MAC1105: Quiz #12 Solutions July 18, 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. Solve: x(x2 + x + 2) = x3 + 3 x3 + x2 + 2x = x3 + 3 x2 + 2x = 3 x2 + 2x - 3 = 0 (x + 3)(x - 1) = 0 x = -3; x = 1 2. Solve: x3 - 2x2 + 4x - 8 = 0 (x3 - 2x2 ) + (4x - 8) = 0 x2 (x - 2) + 4(x - 2) = 0 (x2 + 4)(x - 2) = 0 x = 2; x = 2i 3. Solve:x4 - 5x2 + 4 = 0 u = x2 u2 - 5u + 4 = 0 (u - 4)(u - 1) = 0 (x2 - 4)(x2 - 1) = 0 x = 2; x = 1 4. Solve: 10x4 + 30x3 + 20x2 = 0 10x2 (x2 + 3x + 2) = 0 10x2 (x + 2)(x + 1) = 0 x = 0; x = -2; x = -1 1 ...
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This note was uploaded on 06/07/2011 for the course MAC 1105 taught by Professor Picklesimer during the Summer '10 term at University of Florida.

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