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Math

posted by on .

Solve:

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 - ,

    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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