-x^2+9=0

Answer 1

To solve this quadratic equation, we need to use the quadratic formula:

The standard form for a quadratic equation is ax^2 + bx + c = 0.

In this case, our equation is -x^2 + 9 = 0, so we have a = -1, b = 0, and c = 9.

The quadratic formula is x = (-b ± √(b^2 - 4ac)) / 2a.

Plugging in our values, we get:
x = (0 ± √(0^2 - 4(-1)(9))) / 2(-1)
x = (± √(0 + 36)) / -2
x = (± 6) / -2

Therefore, the solutions to the equation -x^2 + 9 = 0 are:
x = -3 and x = 3.