X^2-10-21=0

Solution for X^2-10-21=0 equation:

Simplifying
X2 + -10 + -21 = 0

Reorder the terms:
-10 + -21 + X2 = 0

Combine like terms: -10 + -21 = -31
-31 + X2 = 0

Solving
-31 + X2 = 0

Solving for variable 'X'.

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

Add '31' to each side of the equation.
-31 + 31 + X2 = 0 + 31

Combine like terms: -31 + 31 = 0
0 + X2 = 0 + 31
X2 = 0 + 31

Combine like terms: 0 + 31 = 31
X2 = 31

Simplifying
X2 = 31

Take the square root of each side:
X = {-5.567764363, 5.567764363}