5x^2+15x+11=0

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Solution for 5x^2+15x+11=0 equation:


Simplifying
5x2 + 15x + 11 = 0

Reorder the terms:
11 + 15x + 5x2 = 0

Solving
11 + 15x + 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'.
2.2 + 3x + x2 = 0

Move the constant term to the right:

Add '-2.2' to each side of the equation.
2.2 + 3x + -2.2 + x2 = 0 + -2.2

Reorder the terms:
2.2 + -2.2 + 3x + x2 = 0 + -2.2

Combine like terms: 2.2 + -2.2 = 0.0
0.0 + 3x + x2 = 0 + -2.2
3x + x2 = 0 + -2.2

Combine like terms: 0 + -2.2 = -2.2
3x + x2 = -2.2

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = -2.2 + 2.25

Reorder the terms:
2.25 + 3x + x2 = -2.2 + 2.25

Combine like terms: -2.2 + 2.25 = 0.05
2.25 + 3x + x2 = 0.05

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 0.05

Calculate the square root of the right side: 0.223606798

Break this problem into two subproblems by setting 
(x + 1.5) equal to 0.223606798 and -0.223606798.

Subproblem 1

x + 1.5 = 0.223606798 Simplifying x + 1.5 = 0.223606798 Reorder the terms: 1.5 + x = 0.223606798 Solving 1.5 + x = 0.223606798 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 0.223606798 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 0.223606798 + -1.5 x = 0.223606798 + -1.5 Combine like terms: 0.223606798 + -1.5 = -1.276393202 x = -1.276393202 Simplifying x = -1.276393202

Subproblem 2

x + 1.5 = -0.223606798 Simplifying x + 1.5 = -0.223606798 Reorder the terms: 1.5 + x = -0.223606798 Solving 1.5 + x = -0.223606798 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -0.223606798 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -0.223606798 + -1.5 x = -0.223606798 + -1.5 Combine like terms: -0.223606798 + -1.5 = -1.723606798 x = -1.723606798 Simplifying x = -1.723606798

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.276393202, -1.723606798}

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