10+3+(-x^2)=0

Solution for 10+3+(-x^2)=0 equation:

Simplifying
10 + 3 + (-1x2) = 0

Combine like terms: 10 + 3 = 13
13 + (-1x2) = 0

Solving
13 + (-1x2) = 0

Solving for variable 'x'.

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

Add '-13' to each side of the equation.
13 + -13 + (-1x2) = 0 + -13

Combine like terms: 13 + -13 = 0
0 + (-1x2) = 0 + -13
(-1x2) = 0 + -13

Combine like terms: 0 + -13 = -13
(-1x2) = -13

Divide each side by '-1'.
x2 = 13

Simplifying
x2 = 13

Take the square root of each side:
x = {-3.605551275, 3.605551275}