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The roots of the equation 3x - 4sqrtx - 4 = 0 a. 1/sqrt3 , 4

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The roots of the equation 3x - 4sqrtx - 4 = 0 a. 1/sqrt3 , 4 [#permalink] New post 29 Jan 2004, 19:22
The roots of the equation 3x - 4sqrtx - 4 = 0
a. 1/sqrt3 , 4
b. 2, 3
c. 4, 4/9
d. 4, 1/9
e. Don't care. Need a beer!
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 [#permalink] New post 29 Jan 2004, 19:29
Let a = sqrt(x) so we have
3a^2-4a-4 = 0

a = -2/3 and a = 2
so x = 4/9 and x = 4 are the roots.

Answer is C
  [#permalink] 29 Jan 2004, 19:29
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The roots of the equation 3x - 4sqrtx - 4 = 0 a. 1/sqrt3 , 4

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