4(3+x^2)=28

Solution for 4(3+x^2)=28 equation:

Simplifying
4(3 + x2) = 28
(3 * 4 + x2 * 4) = 28
(12 + 4x2) = 28

Solving
12 + 4x2 = 28

Solving for variable 'x'.

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

Add '-12' to each side of the equation.
12 + -12 + 4x2 = 28 + -12

Combine like terms: 12 + -12 = 0
0 + 4x2 = 28 + -12
4x2 = 28 + -12

Combine like terms: 28 + -12 = 16
4x2 = 16

Divide each side by '4'.
x2 = 4

Simplifying
x2 = 4

Take the square root of each side:
x = {-2, 2}