15=4+3x^2

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


Simplifying
15 = 4 + 3x2

Solving
15 = 4 + 3x2

Solving for variable 'x'.

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

Add '-3x2' to each side of the equation.
15 + -3x2 = 4 + 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
15 + -3x2 = 4 + 0
15 + -3x2 = 4

Add '-15' to each side of the equation.
15 + -15 + -3x2 = 4 + -15

Combine like terms: 15 + -15 = 0
0 + -3x2 = 4 + -15
-3x2 = 4 + -15

Combine like terms: 4 + -15 = -11
-3x2 = -11

Divide each side by '-3'.
x2 = 3.666666667

Simplifying
x2 = 3.666666667

Take the square root of each side:
x = {-1.914854216, 1.914854216}

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