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17 September, 19:09

What is an approximate x-value for the equation y = - 3x2 + 16 when y = 8?

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  1. 17 September, 19:27
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    y = - 3x² + 16

    y = 8

    -3x² + 16 = 8 | - 16

    -3x² = - 8 | : (-3)

    x² = 8/3

    x² = 4 · 2/3

    x = √ (4 · 2/3)

    x = 2√ (2/3)

    √ (2/3) = 0,81649 ... ≈ 0,82

    x ≈ 2 · 0,82

    x ≈ 1,64
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