4x^2-x-11=0

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Solution for 4x^2-x-11=0 equation:


Simplifying
4x2 + -1x + -11 = 0

Reorder the terms:
-11 + -1x + 4x2 = 0

Solving
-11 + -1x + 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 + -0.25x + x2 = 0

Move the constant term to the right:

Add '2.75' to each side of the equation.
-2.75 + -0.25x + 2.75 + x2 = 0 + 2.75

Reorder the terms:
-2.75 + 2.75 + -0.25x + x2 = 0 + 2.75

Combine like terms: -2.75 + 2.75 = 0.00
0.00 + -0.25x + x2 = 0 + 2.75
-0.25x + x2 = 0 + 2.75

Combine like terms: 0 + 2.75 = 2.75
-0.25x + x2 = 2.75

The x term is -0.25x.  Take half its coefficient (-0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
-0.25x + 0.015625 + x2 = 2.75 + 0.015625

Reorder the terms:
0.015625 + -0.25x + x2 = 2.75 + 0.015625

Combine like terms: 2.75 + 0.015625 = 2.765625
0.015625 + -0.25x + x2 = 2.765625

Factor a perfect square on the left side:
(x + -0.125)(x + -0.125) = 2.765625

Calculate the square root of the right side: 1.663016837

Break this problem into two subproblems by setting 
(x + -0.125) equal to 1.663016837 and -1.663016837.

Subproblem 1

x + -0.125 = 1.663016837 Simplifying x + -0.125 = 1.663016837 Reorder the terms: -0.125 + x = 1.663016837 Solving -0.125 + x = 1.663016837 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + x = 1.663016837 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + x = 1.663016837 + 0.125 x = 1.663016837 + 0.125 Combine like terms: 1.663016837 + 0.125 = 1.788016837 x = 1.788016837 Simplifying x = 1.788016837

Subproblem 2

x + -0.125 = -1.663016837 Simplifying x + -0.125 = -1.663016837 Reorder the terms: -0.125 + x = -1.663016837 Solving -0.125 + x = -1.663016837 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + x = -1.663016837 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + x = -1.663016837 + 0.125 x = -1.663016837 + 0.125 Combine like terms: -1.663016837 + 0.125 = -1.538016837 x = -1.538016837 Simplifying x = -1.538016837

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.788016837, -1.538016837}

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