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MathematicsMathematics
10 November, 09:25

One of the steps Rob used to solve an equation is shown below.

-5 (3x + 7) = 10

-15x + - 35 = 10

A:Rob added - 5 and 3x to eliminate the parentheses. This procedure is justified by the associative property.

B:Rob added - 5 and 3x to eliminate the parentheses. This procedure is justified by the distributive property.

C:Rob multiplied 3x and 7 by - 5 to eliminate the parentheses. This procedure is justified by the associative property.

D:Rob multiplied 3x and 7 by - 5 to eliminate the parentheses. This procedure is justified by the distributive property.

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Answers (1)
  1. 10 November, 11:16
    0
    D

    Step-by-step explanation:

    Let's review the distributive property.

    It is

    a (b+c) = ab + ac

    Whenever we have a sum/difference multiplied by a number upfront, we need to eliminate the parenthesis. We do it by multiplying the constant with the terms of the sum/difference inside the parenthesis, each respectively.

    Looking at 2 steps, we see Rob:

    eliminated the parenthesis by multiplying - 5 with both "3x" and "+7" used the distributive property

    From the answer choices, D is right.
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Home » Mathematics » One of the steps Rob used to solve an equation is shown below. -5 (3x + 7) = 10 -15x + - 35 = 10 A:Rob added - 5 and 3x to eliminate the parentheses. This procedure is justified by the associative property.
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