5a^2-18a+1=0

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Solution for 5a^2-18a+1=0 equation:


Simplifying
5a2 + -18a + 1 = 0

Reorder the terms:
1 + -18a + 5a2 = 0

Solving
1 + -18a + 5a2 = 0

Solving for variable 'a'.

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

Divide each side by '5'.
0.2 + -3.6a + a2 = 0

Move the constant term to the right:

Add '-0.2' to each side of the equation.
0.2 + -3.6a + -0.2 + a2 = 0 + -0.2

Reorder the terms:
0.2 + -0.2 + -3.6a + a2 = 0 + -0.2

Combine like terms: 0.2 + -0.2 = 0.0
0.0 + -3.6a + a2 = 0 + -0.2
-3.6a + a2 = 0 + -0.2

Combine like terms: 0 + -0.2 = -0.2
-3.6a + a2 = -0.2

The a term is -3.6a.  Take half its coefficient (-1.8).
Square it (3.24) and add it to both sides.

Add '3.24' to each side of the equation.
-3.6a + 3.24 + a2 = -0.2 + 3.24

Reorder the terms:
3.24 + -3.6a + a2 = -0.2 + 3.24

Combine like terms: -0.2 + 3.24 = 3.04
3.24 + -3.6a + a2 = 3.04

Factor a perfect square on the left side:
(a + -1.8)(a + -1.8) = 3.04

Calculate the square root of the right side: 1.743559577

Break this problem into two subproblems by setting 
(a + -1.8) equal to 1.743559577 and -1.743559577.

Subproblem 1

a + -1.8 = 1.743559577 Simplifying a + -1.8 = 1.743559577 Reorder the terms: -1.8 + a = 1.743559577 Solving -1.8 + a = 1.743559577 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1.8' to each side of the equation. -1.8 + 1.8 + a = 1.743559577 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + a = 1.743559577 + 1.8 a = 1.743559577 + 1.8 Combine like terms: 1.743559577 + 1.8 = 3.543559577 a = 3.543559577 Simplifying a = 3.543559577

Subproblem 2

a + -1.8 = -1.743559577 Simplifying a + -1.8 = -1.743559577 Reorder the terms: -1.8 + a = -1.743559577 Solving -1.8 + a = -1.743559577 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1.8' to each side of the equation. -1.8 + 1.8 + a = -1.743559577 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + a = -1.743559577 + 1.8 a = -1.743559577 + 1.8 Combine like terms: -1.743559577 + 1.8 = 0.056440423 a = 0.056440423 Simplifying a = 0.056440423

Solution

The solution to the problem is based on the solutions from the subproblems. a = {3.543559577, 0.056440423}

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