Math
posted by Henry 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

1. correct, I would change √24 to 2√6
2. 9x^3  25x = 0
x(9x^2  25) = 0
x(3x+5)(3x5) = 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(x2) + 4(x2) = 0
(x2)(x^2+4) = 0
x = 2 or x = ±2i