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Rob is asked to simplify the expression below.

10x-2 (4x+6y) + 3y

He states that the simplified expression is 2x+15y because using the Distributive Property yields 10x-8x+12y+3y, and then combining like terms yields 2x+15y.

Explain the error in Rob' s reasoning.

Write the correct simplified expression for 10x-2 (4x+6y) + 3y. Show your work.

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  1. 6 May, 13:53
    0
    He forgot to change ALL the sign inside the bracket.

    It should read:

    10x-8x-12y+3y=2x-9y
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