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09-03-2020
Mathematics

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

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guskarose guskarose

09-03-2020

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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