5x^2+12x+5=0

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Solution for 5x^2+12x+5=0 equation:


Simplifying
5x2 + 12x + 5 = 0

Reorder the terms:
5 + 12x + 5x2 = 0

Solving
5 + 12x + 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 + 2.4x + x2 = 0

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + 2.4x + -1 + x2 = 0 + -1

Reorder the terms:
1 + -1 + 2.4x + x2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + 2.4x + x2 = 0 + -1
2.4x + x2 = 0 + -1

Combine like terms: 0 + -1 = -1
2.4x + x2 = -1

The x term is 2.4x.  Take half its coefficient (1.2).
Square it (1.44) and add it to both sides.

Add '1.44' to each side of the equation.
2.4x + 1.44 + x2 = -1 + 1.44

Reorder the terms:
1.44 + 2.4x + x2 = -1 + 1.44

Combine like terms: -1 + 1.44 = 0.44
1.44 + 2.4x + x2 = 0.44

Factor a perfect square on the left side:
(x + 1.2)(x + 1.2) = 0.44

Calculate the square root of the right side: 0.663324958

Break this problem into two subproblems by setting 
(x + 1.2) equal to 0.663324958 and -0.663324958.

Subproblem 1

x + 1.2 = 0.663324958 Simplifying x + 1.2 = 0.663324958 Reorder the terms: 1.2 + x = 0.663324958 Solving 1.2 + x = 0.663324958 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.2' to each side of the equation. 1.2 + -1.2 + x = 0.663324958 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + x = 0.663324958 + -1.2 x = 0.663324958 + -1.2 Combine like terms: 0.663324958 + -1.2 = -0.536675042 x = -0.536675042 Simplifying x = -0.536675042

Subproblem 2

x + 1.2 = -0.663324958 Simplifying x + 1.2 = -0.663324958 Reorder the terms: 1.2 + x = -0.663324958 Solving 1.2 + x = -0.663324958 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.2' to each side of the equation. 1.2 + -1.2 + x = -0.663324958 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + x = -0.663324958 + -1.2 x = -0.663324958 + -1.2 Combine like terms: -0.663324958 + -1.2 = -1.863324958 x = -1.863324958 Simplifying x = -1.863324958

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.536675042, -1.863324958}

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