15+3x^2=30

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Solution for 15+3x^2=30 equation: 


Simplifying
15 + 3x2 = 30

Solving
15 + 3x2 = 30

Solving for variable 'x'.

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

Add '-15' to each side of the equation.
15 + -15 + 3x2 = 30 + -15

Combine like terms: 15 + -15 = 0
0 + 3x2 = 30 + -15
3x2 = 30 + -15

Combine like terms: 30 + -15 = 15
3x2 = 15

Divide each side by '3'.
x2 = 5

Simplifying
x2 = 5

Take the square root of each side:
x = {-2.236067978, 2.236067978}

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