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9 January, 11:26

What is the solution to this equation?

7x-2 (x - 10) = 40

O A. x = 10

O B. x = 4

O c. x = 12

O D. x = 6

+4
Answers (2)
  1. 9 January, 11:28
    0
    x=4

    Step-by-step explanation:

    7x-2 (x - 10) = 40

    Distribute

    7x - 2x + 20 = 40

    Combine like terms

    5x + 20 = 40

    Subtract 20

    5x + 20 - 20 = 40-20

    5x = 20

    Divide by 5

    5x/5 = 20/5

    x = 4
  2. 9 January, 11:52
    0
    B.

    Step-by-step explanation:

    The quickest and fastest way to do this is to guess and check. Simply plug in the given values one by one into a calc and you should see that x = 4 works.
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