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Mathematics
Leyla Nguyen
30 January, 12:02
If x^2+2=3^2/3+3^-2/3 then prove that 3x^3+9x-8=0
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Kason Logan
30 January, 13:22
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here is the solution
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Rory Hickman
30 January, 15:58
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See below.
Step-by-step explanation:
x^2 + 2 = 3^2/3 + 3^-2/3
x^2 = 3^2/3 + 3^-2/3 - 2
x = √ (3^2/3 + 3^-2/3 - 2)
x = 0.748888296
Substitute for x in 3x^3 + 9x - 8:
3 (0.748888296) ^3 + 9 (0.748888296) - 8 = 0.
So it is proved.
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