49a^2-81=0

Solution for 49a^2-81=0 equation:

Simplifying
49a2 + -81 = 0

Reorder the terms:
-81 + 49a2 = 0

Solving
-81 + 49a2 = 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 + 49a2 = 0 + 81

Combine like terms: -81 + 81 = 0
0 + 49a2 = 0 + 81
49a2 = 0 + 81

Combine like terms: 0 + 81 = 81
49a2 = 81

Divide each side by '49'.
a2 = 1.653061224

Simplifying
a2 = 1.653061224

Take the square root of each side:
a = {-1.285714286, 1.285714286}