MATH 125 LA Valley College Authentic Assessment Error Analysis Exercises
Question Description
RUBRIC:
GRADE (10 points) – 3 points will be given for finding error, 2 points for a logical explanation on why it is incorrect. After posting your response, 5 points will be giving for replying to 3 of your classmates post.
AUTHENTIC ASSESSMENT: ERROR ANALYSIS
Find the errors, if any, in the following problems; explain why it is incorrect:
1. Find the GCF for 108x3y2 and 56x2y4. 108 = 2*54 = 2*2*27 = 2*2*3*9 = 2*2*3*3*3 = 22*33 so 108x3y2 = 22*33 x3 y2
56 = 2*28 = 2*2*14 = 2*2*2*7 = 23 * 7 so 56x2y4 = 23 * 7 x2 y4 The GCF = 23 * 33 * 7 x3 * y4 = 504 x3 * y4
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2. Multiply: (2x – 5) (3x2 – 4x + 1) = 6x3 – 8x2 + 2x – 15x2 – 20x – 5 = 6x3 – 23x2 – 18x – 5
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3. Factor: 16x2 – y2 = (4x – y)2
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4. Factor: 8ax – 4a – 6x + 3 = 4a(2x – 1) + 3(2x – 1) = (4a + 3)(2x – 1)
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