9a^2-4=

Solution for 9a^2-4= equation:

Simplifying
9a2 + -4 = 0

Reorder the terms:
-4 + 9a2 = 0

Solving
-4 + 9a2 = 0

Solving for variable 'a'.

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

Add '4' to each side of the equation.
-4 + 4 + 9a2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 9a2 = 0 + 4
9a2 = 0 + 4

Combine like terms: 0 + 4 = 4
9a2 = 4

Divide each side by '9'.
a2 = 0.4444444444

Simplifying
a2 = 0.4444444444

Take the square root of each side:
a = {-0.666666667, 0.666666667}