7x^2+21=0

Solution for 7x^2+21=0 equation:

Simplifying
7x2 + 21 = 0

Reorder the terms:
21 + 7x2 = 0

Solving
21 + 7x2 = 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 + 7x2 = 0 + -21

Combine like terms: 21 + -21 = 0
0 + 7x2 = 0 + -21
7x2 = 0 + -21

Combine like terms: 0 + -21 = -21
7x2 = -21

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

Simplifying
x2 = -3

Reorder the terms:
3 + x2 = -3 + 3

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

The solution to this equation could not be determined.