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24 August, 02:32

Select all of the values that are solutions of x2 + 20 = 12x. x = - 10 x = - 2 x = 2 x = 10

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Answers (2)
  1. 24 August, 02:57
    0
    2 and 10
  2. 24 August, 03:33
    0
    2, and 10

    Step-by-step explanation:

    Let's work through each one.

    First, plug - 10 into the equation:

    -10² + 20 = 12 x - 10?

    -10² = 100

    100 + 20 = 120

    12 x - 10 = - 120

    120 = - 120? False!

    But, using these same calculations, we can see that 10 is a correct answer.

    Because everything's the same up to 12 x 10 = 120.

    120 = 120

    Same with 2 and - 2

    -2 does not work, but 2 does.

    2² + 20 = 12 x 2?

    4 + 20 = 24?

    24 = 24? True!
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