a^2+4.1a+4=0

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Solution for a^2+4.1a+4=0 equation:


Simplifying
a2 + 4.1a + 4 = 0

Reorder the terms:
4 + 4.1a + a2 = 0

Solving
4 + 4.1a + a2 = 0

Solving for variable 'a'.

Begin completing the square.

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + 4.1a + -4 + a2 = 0 + -4

Reorder the terms:
4 + -4 + 4.1a + a2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + 4.1a + a2 = 0 + -4
4.1a + a2 = 0 + -4

Combine like terms: 0 + -4 = -4
4.1a + a2 = -4

The a term is 4.1a.  Take half its coefficient (2.05).
Square it (4.2025) and add it to both sides.

Add '4.2025' to each side of the equation.
4.1a + 4.2025 + a2 = -4 + 4.2025

Reorder the terms:
4.2025 + 4.1a + a2 = -4 + 4.2025

Combine like terms: -4 + 4.2025 = 0.2025
4.2025 + 4.1a + a2 = 0.2025

Factor a perfect square on the left side:
(a + 2.05)(a + 2.05) = 0.2025

Calculate the square root of the right side: 0.45

Break this problem into two subproblems by setting 
(a + 2.05) equal to 0.45 and -0.45.

Subproblem 1

a + 2.05 = 0.45 Simplifying a + 2.05 = 0.45 Reorder the terms: 2.05 + a = 0.45 Solving 2.05 + a = 0.45 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2.05' to each side of the equation. 2.05 + -2.05 + a = 0.45 + -2.05 Combine like terms: 2.05 + -2.05 = 0.00 0.00 + a = 0.45 + -2.05 a = 0.45 + -2.05 Combine like terms: 0.45 + -2.05 = -1.6 a = -1.6 Simplifying a = -1.6

Subproblem 2

a + 2.05 = -0.45 Simplifying a + 2.05 = -0.45 Reorder the terms: 2.05 + a = -0.45 Solving 2.05 + a = -0.45 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2.05' to each side of the equation. 2.05 + -2.05 + a = -0.45 + -2.05 Combine like terms: 2.05 + -2.05 = 0.00 0.00 + a = -0.45 + -2.05 a = -0.45 + -2.05 Combine like terms: -0.45 + -2.05 = -2.5 a = -2.5 Simplifying a = -2.5

Solution

The solution to the problem is based on the solutions from the subproblems. a = {-1.6, -2.5}

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