Posted by Henry on Wednesday, September 1, 2010 at 8:32am.
1. correct, I would change √24 to 2√6
2. 9x^3 - 25x = 0
x(9x^2 - 25) = 0
x(3x+5)(3x-5) = 0
x = 0, ±5/3
3. simplify to x^2 - 2x -1 = 0
then use the quadratic formula
4. x^3 - 2x^2 + 4x - 8 = 0
x^2(x-2) + 4(x-2) = 0
(x-2)(x^2+4) = 0
x = 2 or x = ±2i
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