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21 June, 00:38

Evaluate 2x^2 - 1 when x=3

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Answers (2)
  1. 21 June, 00:43
    0
    17.

    Step by step explanation:

    Substitute the value of x into the equation and square it.

    the equation then becomes 2 (3) ^2 - 1

    but 3^2 = 3*3 = 9

    So the equation is changed to 2 (9) - 1 after the simplification

    given you 18-1

    =17
  2. 21 June, 01:02
    0
    17

    Step-by-step explanation:

    Given: 2x² - 1

    when x=3

    2 (3) ² - 1

    = 2 (9) - 1

    = 18 - 1

    = 17
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