4x^2+13.5x+11=0

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Solution for 4x^2+13.5x+11=0 equation:


Simplifying
4x2 + 13.5x + 11 = 0

Reorder the terms:
11 + 13.5x + 4x2 = 0

Solving
11 + 13.5x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
2.75 + 3.375x + x2 = 0

Move the constant term to the right:

Add '-2.75' to each side of the equation.
2.75 + 3.375x + -2.75 + x2 = 0 + -2.75

Reorder the terms:
2.75 + -2.75 + 3.375x + x2 = 0 + -2.75

Combine like terms: 2.75 + -2.75 = 0.00
0.00 + 3.375x + x2 = 0 + -2.75
3.375x + x2 = 0 + -2.75

Combine like terms: 0 + -2.75 = -2.75
3.375x + x2 = -2.75

The x term is 3.375x.  Take half its coefficient (1.6875).
Square it (2.84765625) and add it to both sides.

Add '2.84765625' to each side of the equation.
3.375x + 2.84765625 + x2 = -2.75 + 2.84765625

Reorder the terms:
2.84765625 + 3.375x + x2 = -2.75 + 2.84765625

Combine like terms: -2.75 + 2.84765625 = 0.09765625
2.84765625 + 3.375x + x2 = 0.09765625

Factor a perfect square on the left side:
(x + 1.6875)(x + 1.6875) = 0.09765625

Calculate the square root of the right side: 0.3125

Break this problem into two subproblems by setting 
(x + 1.6875) equal to 0.3125 and -0.3125.

Subproblem 1

x + 1.6875 = 0.3125 Simplifying x + 1.6875 = 0.3125 Reorder the terms: 1.6875 + x = 0.3125 Solving 1.6875 + x = 0.3125 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.6875' to each side of the equation. 1.6875 + -1.6875 + x = 0.3125 + -1.6875 Combine like terms: 1.6875 + -1.6875 = 0.0000 0.0000 + x = 0.3125 + -1.6875 x = 0.3125 + -1.6875 Combine like terms: 0.3125 + -1.6875 = -1.375 x = -1.375 Simplifying x = -1.375

Subproblem 2

x + 1.6875 = -0.3125 Simplifying x + 1.6875 = -0.3125 Reorder the terms: 1.6875 + x = -0.3125 Solving 1.6875 + x = -0.3125 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.6875' to each side of the equation. 1.6875 + -1.6875 + x = -0.3125 + -1.6875 Combine like terms: 1.6875 + -1.6875 = 0.0000 0.0000 + x = -0.3125 + -1.6875 x = -0.3125 + -1.6875 Combine like terms: -0.3125 + -1.6875 = -2 x = -2 Simplifying x = -2

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.375, -2}

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