0.03383a^2+a-640.44=0

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Solution for 0.03383a^2+a-640.44=0 equation:


Simplifying
0.03383a2 + a + -640.44 = 0

Reorder the terms:
-640.44 + a + 0.03383a2 = 0

Solving
-640.44 + a + 0.03383a2 = 0

Solving for variable 'a'.

Begin completing the square.  Divide all terms by
0.03383 the coefficient of the squared term: 

Divide each side by '0.03383'.
-18931.12622 + 29.55956252a + a2 = 0

Move the constant term to the right:

Add '18931.12622' to each side of the equation.
-18931.12622 + 29.55956252a + 18931.12622 + a2 = 0 + 18931.12622

Reorder the terms:
-18931.12622 + 18931.12622 + 29.55956252a + a2 = 0 + 18931.12622

Combine like terms: -18931.12622 + 18931.12622 = 0.00000
0.00000 + 29.55956252a + a2 = 0 + 18931.12622
29.55956252a + a2 = 0 + 18931.12622

Combine like terms: 0 + 18931.12622 = 18931.12622
29.55956252a + a2 = 18931.12622

The a term is a.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
29.55956252a + 0.25 + a2 = 18931.12622 + 0.25

Reorder the terms:
0.25 + 29.55956252a + a2 = 18931.12622 + 0.25

Combine like terms: 18931.12622 + 0.25 = 18931.37622
0.25 + 29.55956252a + a2 = 18931.37622

Factor a perfect square on the left side:
(a + 0.5)(a + 0.5) = 18931.37622

Calculate the square root of the right side: 137.591337736

Break this problem into two subproblems by setting 
(a + 0.5) equal to 137.591337736 and -137.591337736.

Subproblem 1

a + 0.5 = 137.591337736 Simplifying a + 0.5 = 137.591337736 Reorder the terms: 0.5 + a = 137.591337736 Solving 0.5 + a = 137.591337736 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + a = 137.591337736 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + a = 137.591337736 + -0.5 a = 137.591337736 + -0.5 Combine like terms: 137.591337736 + -0.5 = 137.091337736 a = 137.091337736 Simplifying a = 137.091337736

Subproblem 2

a + 0.5 = -137.591337736 Simplifying a + 0.5 = -137.591337736 Reorder the terms: 0.5 + a = -137.591337736 Solving 0.5 + a = -137.591337736 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + a = -137.591337736 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + a = -137.591337736 + -0.5 a = -137.591337736 + -0.5 Combine like terms: -137.591337736 + -0.5 = -138.091337736 a = -138.091337736 Simplifying a = -138.091337736

Solution

The solution to the problem is based on the solutions from the subproblems. a = {137.091337736, -138.091337736}

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