5x^2+11x+5=0

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Solution for 5x^2+11x+5=0 equation:


Simplifying
5x2 + 11x + 5 = 0

Reorder the terms:
5 + 11x + 5x2 = 0

Solving
5 + 11x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
1 + 2.2x + x2 = 0

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + 2.2x + -1 + x2 = 0 + -1

Reorder the terms:
1 + -1 + 2.2x + x2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + 2.2x + x2 = 0 + -1
2.2x + x2 = 0 + -1

Combine like terms: 0 + -1 = -1
2.2x + x2 = -1

The x term is 2.2x.  Take half its coefficient (1.1).
Square it (1.21) and add it to both sides.

Add '1.21' to each side of the equation.
2.2x + 1.21 + x2 = -1 + 1.21

Reorder the terms:
1.21 + 2.2x + x2 = -1 + 1.21

Combine like terms: -1 + 1.21 = 0.21
1.21 + 2.2x + x2 = 0.21

Factor a perfect square on the left side:
(x + 1.1)(x + 1.1) = 0.21

Calculate the square root of the right side: 0.458257569

Break this problem into two subproblems by setting 
(x + 1.1) equal to 0.458257569 and -0.458257569.

Subproblem 1

x + 1.1 = 0.458257569 Simplifying x + 1.1 = 0.458257569 Reorder the terms: 1.1 + x = 0.458257569 Solving 1.1 + x = 0.458257569 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.1' to each side of the equation. 1.1 + -1.1 + x = 0.458257569 + -1.1 Combine like terms: 1.1 + -1.1 = 0.0 0.0 + x = 0.458257569 + -1.1 x = 0.458257569 + -1.1 Combine like terms: 0.458257569 + -1.1 = -0.641742431 x = -0.641742431 Simplifying x = -0.641742431

Subproblem 2

x + 1.1 = -0.458257569 Simplifying x + 1.1 = -0.458257569 Reorder the terms: 1.1 + x = -0.458257569 Solving 1.1 + x = -0.458257569 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.1' to each side of the equation. 1.1 + -1.1 + x = -0.458257569 + -1.1 Combine like terms: 1.1 + -1.1 = 0.0 0.0 + x = -0.458257569 + -1.1 x = -0.458257569 + -1.1 Combine like terms: -0.458257569 + -1.1 = -1.558257569 x = -1.558257569 Simplifying x = -1.558257569

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.641742431, -1.558257569}

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