Tuesday

October 21, 2014

October 21, 2014

Posted by **Henry** on Wednesday, September 1, 2010 at 8:32am.

1.) 2x² + 24 = x²

The answers I obtained were:

x = i√24 and x= -i√24 are these correct?

2.) 9x³ = 25x

3.) 5x² - x = 7x² - 5x - 2

4.) 2x² = x³ + 4x - 8

~Thank you

- Math -
**Reiny**, Wednesday, September 1, 2010 at 9:49am1. 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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