-3х^2+15=0

To solve the equation -3x^2 + 15 = 0, we can start by subtracting 15 from both sides:

-3x^2 = -15

Next, divide both sides by -3 to isolate x^2:

x^2 = 5

To solve for x, we can take the square root of both sides:

√(x^2) = √(5)

Since both the positive and negative square roots of a number can be solutions, we get two equations:

x = √(5) x = -√(5)

So the solutions to the equation -3x^2 + 15 = 0 are x = √(5) and x = -√(5).