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Ella simplifies (4b+4r)+(-2b-r) and says the result is b + 5r. What error did Ella make?
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3 votes
Ella simplifies (4b+4r)+(-2b-r) and says the result is b + 5r. What error did Ella make?

User Jack Guo
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2 Answers

5 votes
4b+4r-2b-r

4b-2b+4r-r

2b+3r

the mistake was that she add the 2 with 3 and got b+5r
User SimonW
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7.6k points
3 votes
Ella incorrectly combined the r coefficients. The correctly simplified expression is b + 3r
User Hari Kishore
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7.8k points
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