84=x^2+3

Solution for 84=x^2+3 equation:

Simplifying
84 = x2 + 3

Reorder the terms:
84 = 3 + x2

Solving
84 = 3 + x2

Solving for variable 'x'.

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

Add '-1x2' to each side of the equation.
84 + -1x2 = 3 + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
84 + -1x2 = 3 + 0
84 + -1x2 = 3

Add '-84' to each side of the equation.
84 + -84 + -1x2 = 3 + -84

Combine like terms: 84 + -84 = 0
0 + -1x2 = 3 + -84
-1x2 = 3 + -84

Combine like terms: 3 + -84 = -81
-1x2 = -81

Divide each side by '-1'.
x2 = 81

Simplifying
x2 = 81

Take the square root of each side:
x = {-9, 9}