3(x^2+4)-15=3

Solution for 3(x^2+4)-15=3 equation:

Simplifying
3(x2 + 4) + -15 = 3

Reorder the terms:
3(4 + x2) + -15 = 3
(4 * 3 + x2 * 3) + -15 = 3
(12 + 3x2) + -15 = 3

Reorder the terms:
12 + -15 + 3x2 = 3

Combine like terms: 12 + -15 = -3
-3 + 3x2 = 3

Solving
-3 + 3x2 = 3

Solving for variable 'x'.

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

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

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

Combine like terms: 3 + 3 = 6
3x2 = 6

Divide each side by '3'.
x2 = 2

Simplifying
x2 = 2

Take the square root of each side:
x = {-1.414213562, 1.414213562}