Perform the quadratic equation on the following:
9x² + 25 = 0
i think you mean solve the quadratic equation, you cant "perform" an equation. first just to clarify, are you sure it wasn't 9x^2 - 25 = 0?
if not, the equation has no real solutions, the solutions will be complex numbers. so here goes.
9x^2 + 25 = 0
=> 9x^2 = -25
=> x^2 = -25/9
=> x = +/- sqrt(-25/9)
=> x = +/- sqrt(25/9)i
=> x = +/- 5/3 i