21-3x^2=0

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Solution for 21-3x^2=0 equation: 


Simplifying
21 + -3x2 = 0

Solving
21 + -3x2 = 0

Solving for variable 'x'.

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

Add '-21' to each side of the equation.
21 + -21 + -3x2 = 0 + -21

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

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

Divide each side by '-3'.
x2 = 7

Simplifying
x2 = 7

Take the square root of each side:
x = {-2.645751311, 2.645751311}

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