0=59-0.3x^2

Solution for 0=59-0.3x^2 equation:

Simplifying
0 = 59 + -0.3x2

Solving
0 = 59 + -0.3x2

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '0.3x2' to each side of the equation.
0 + 0.3x2 = 59 + -0.3x2 + 0.3x2
Remove the zero:
0.3x2 = 59 + -0.3x2 + 0.3x2

Combine like terms: -0.3x2 + 0.3x2 = 0.0
0.3x2 = 59 + 0.0
0.3x2 = 59

Divide each side by '0.3'.
x2 = 196.6666667

Simplifying
x2 = 196.6666667

Take the square root of each side:
x = {-14.023789313, 14.023789313}