3x^2+12=21

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Solution for 3x^2+12=21 equation: 


Simplifying
3x2 + 12 = 21

Reorder the terms:
12 + 3x2 = 21

Solving
12 + 3x2 = 21

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 + 3x2 = 21 + -12

Combine like terms: 12 + -12 = 0
0 + 3x2 = 21 + -12
3x2 = 21 + -12

Combine like terms: 21 + -12 = 9
3x2 = 9

Divide each side by '3'.
x2 = 3

Simplifying
x2 = 3

Take the square root of each side:
x = {-1.732050808, 1.732050808}

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