a^2+5a+1=0

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


Simplifying
a2 + 5a + 1 = 0

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

Solving
1 + 5a + a2 = 0

Solving for variable 'a'.

Begin completing the square.

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + 5a + -1 + a2 = 0 + -1

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

Combine like terms: 1 + -1 = 0
0 + 5a + a2 = 0 + -1
5a + a2 = 0 + -1

Combine like terms: 0 + -1 = -1
5a + a2 = -1

The a term is 5a.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5a + 6.25 + a2 = -1 + 6.25

Reorder the terms:
6.25 + 5a + a2 = -1 + 6.25

Combine like terms: -1 + 6.25 = 5.25
6.25 + 5a + a2 = 5.25

Factor a perfect square on the left side:
(a + 2.5)(a + 2.5) = 5.25

Calculate the square root of the right side: 2.291287847

Break this problem into two subproblems by setting 
(a + 2.5) equal to 2.291287847 and -2.291287847.

Subproblem 1

a + 2.5 = 2.291287847 Simplifying a + 2.5 = 2.291287847 Reorder the terms: 2.5 + a = 2.291287847 Solving 2.5 + a = 2.291287847 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + a = 2.291287847 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + a = 2.291287847 + -2.5 a = 2.291287847 + -2.5 Combine like terms: 2.291287847 + -2.5 = -0.208712153 a = -0.208712153 Simplifying a = -0.208712153

Subproblem 2

a + 2.5 = -2.291287847 Simplifying a + 2.5 = -2.291287847 Reorder the terms: 2.5 + a = -2.291287847 Solving 2.5 + a = -2.291287847 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + a = -2.291287847 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + a = -2.291287847 + -2.5 a = -2.291287847 + -2.5 Combine like terms: -2.291287847 + -2.5 = -4.791287847 a = -4.791287847 Simplifying a = -4.791287847

Solution

The solution to the problem is based on the solutions from the subproblems. a = {-0.208712153, -4.791287847}

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