Select the approximate values of x that are solutions to f(x) = 0, where f(x) = -8x2 + 3x + 9.
f(x) = -8x^2 + 3x + 9 when f(x) = 0, -8x^2 + 3x + 9 = 0 b^2 - 4ac = 3^2 - 4(-8)(9) = 9 + 288 = 297 x = [-b ± sqrt (b^2 - 4ac)]/2a = (-3 ± sqrt 297)/-16 = (-3 ± 3 sqrt 33)/-16 x1 = -0.89 x2 = 1.26
Updated 8/11/2014 9:18:32 PM
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f(x) = -8x^2 + 3x + 9
when f(x) = 0,
-8x^2 + 3x + 9 = 0
b^2 - 4ac = 3^2 - 4(-8)(9) = 9 + 288 = 297
x = [-b ± sqrt (b^2 - 4ac)]/2a
= (-3 ± sqrt 297)/-16
= (-3 ± 3 sqrt 33)/-16
x1 = -0.89
x2 = 1.26
Confirmed by andrewpallarca [8/11/2014 9:21:22 PM]

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