3x^2+21=15

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Solution for 3x^2+21=15 equation:


Simplifying
3x2 + 21 = 15

Reorder the terms:
21 + 3x2 = 15

Solving
21 + 3x2 = 15

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 = 15 + -21

Combine like terms: 21 + -21 = 0
0 + 3x2 = 15 + -21
3x2 = 15 + -21

Combine like terms: 15 + -21 = -6
3x2 = -6

Divide each side by '3'.
x2 = -2

Simplifying
x2 = -2

Reorder the terms:
2 + x2 = -2 + 2

Combine like terms: -2 + 2 = 0
2 + x2 = 0

The solution to this equation could not be determined.

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