-9a^2+4a-9=0

Solution for -9a^2+4a-9=0 equation:

Simplifying
-9a2 + 4a + -9 = 0

Reorder the terms:
-9 + 4a + -9a2 = 0

Solving
-9 + 4a + -9a2 = 0

Solving for variable 'a'.

Begin completing the square.  Divide all terms by
-9 the coefficient of the squared term: 

Divide each side by '-9'.
1 + -0.4444444444a + a2 = 0

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + -0.4444444444a + -1 + a2 = 0 + -1

Reorder the terms:
1 + -1 + -0.4444444444a + a2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -0.4444444444a + a2 = 0 + -1
-0.4444444444a + a2 = 0 + -1

Combine like terms: 0 + -1 = -1
-0.4444444444a + a2 = -1

The a term is -0.4444444444a.  Take half its coefficient (-0.2222222222).
Square it (0.04938271604) and add it to both sides.

Add '0.04938271604' to each side of the equation.
-0.4444444444a + 0.04938271604 + a2 = -1 + 0.04938271604

Reorder the terms:
0.04938271604 + -0.4444444444a + a2 = -1 + 0.04938271604

Combine like terms: -1 + 0.04938271604 = -0.95061728396
0.04938271604 + -0.4444444444a + a2 = -0.95061728396

Factor a perfect square on the left side:
(a + -0.2222222222)(a + -0.2222222222) = -0.95061728396

Can't calculate square root of the right side.

The solution to this equation could not be determined.