81-100a^2=

Solution for 81-100a^2= equation:

Simplifying
81 + -100a2 = 0

Solving
81 + -100a2 = 0

Solving for variable 'a'.

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

Add '-81' to each side of the equation.
81 + -81 + -100a2 = 0 + -81

Combine like terms: 81 + -81 = 0
0 + -100a2 = 0 + -81
-100a2 = 0 + -81

Combine like terms: 0 + -81 = -81
-100a2 = -81

Divide each side by '-100'.
a2 = 0.81

Simplifying
a2 = 0.81

Take the square root of each side:
a = {-0.9, 0.9}