6z^2-21=0

Solution for 6z^2-21=0 equation:

Simplifying
6z2 + -21 = 0

Reorder the terms:
-21 + 6z2 = 0

Solving
-21 + 6z2 = 0

Solving for variable 'z'.

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

Add '21' to each side of the equation.
-21 + 21 + 6z2 = 0 + 21

Combine like terms: -21 + 21 = 0
0 + 6z2 = 0 + 21
6z2 = 0 + 21

Combine like terms: 0 + 21 = 21
6z2 = 21

Divide each side by '6'.
z2 = 3.5

Simplifying
z2 = 3.5

Take the square root of each side:
z = {-1.870828693, 1.870828693}