Margie’s work for adding linear expressions is shown below. After checking her answer with the answer key, she solved it incorrect

Question

Margie’s work for adding linear expressions is shown below. After checking her answer with the answer key, she solved it incorrectly.

Given (−1.56b + 10) − (4.27b − 14)
Step 1 −1.56b + 10 + (−4.27b) + 14
Step 2 −1.56b + 4.27b + 10 + 14
Step 3 (−1.56b + 4.27b) + (10 + 14)
Step 4 2.71b + 24

Part A: Identify and explain the first step where Margie made an error. (6 points)

Part B: Explain how to correctly write the expression in fewest terms by correcting the error in Part A. Show all work. (6 points)

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Nem 1 month 2022-12-26T13:52:22+00:00 1 Answer 0 views 0

Answer ( 1 )

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    2022-12-26T13:53:58+00:00
    Answer:
    a. Margie made a mistake in step 2. Even though there is a positive plus next to -4.27b it cancells out and keeps the -4.27b as it is.
    b. Given (−1.56b + 10) − (4.27b − 14)
    Step 1 −1.56b + 10 + (−4.27b) + 14
    Step 2 −1.56b – 4.27b + 10 + 14
    Step 3 (−1.56b – 4.27b) + (10 + 14)
    Step 4 -5.83b + 24

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