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7 January, 23:37

A student claims that 3 (3x + 2) + 5 - 4x is equivalent to 5x + 7; however, the student is incorrect. The student's work is shown below: Step 1: 3 (3x + 2) + 5 - 4x Step 2: 9x + 2 + 5 - 4x Step 3: 9x - 4x + 2 + 5 Step 4: 5x + 7 Describe the error in the student's work.

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  1. 7 January, 23:52
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    The answer to your question is below

    Step-by-step explanation:

    3 (3x + 2) + 5 - 4x = 5x + 7

    Step 1: 3 (3x + 2) + 5 - 4x There is no error here, only wrote the

    polynomial again

    Step 2: 9x + 2 + 5 - 4x He forgot to multiply 3 x 2 = 6

    9x + 6 + 5 - 4x

    Step 3: 9x - 4x + 2 + 5 He simplified like terms

    Step 4: 5x + 7 but is incorrect due to his mistake

    The right answer should be 5x + 11
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