-3x^2=21

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Solution for -3x^2=21 equation: 


Simplifying
-3x2 = 21

Solving
-3x2 = 21

Solving for variable 'x'.

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

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

Simplifying
x2 = -7

Reorder the terms:
7 + x2 = -7 + 7

Combine like terms: -7 + 7 = 0
7 + x2 = 0

The solution to this equation could not be determined.

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