4x^2-2x-55=0

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Solution for 4x^2-2x-55=0 equation:


Simplifying
4x2 + -2x + -55 = 0

Reorder the terms:
-55 + -2x + 4x2 = 0

Solving
-55 + -2x + 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'.
-13.75 + -0.5x + x2 = 0

Move the constant term to the right:

Add '13.75' to each side of the equation.
-13.75 + -0.5x + 13.75 + x2 = 0 + 13.75

Reorder the terms:
-13.75 + 13.75 + -0.5x + x2 = 0 + 13.75

Combine like terms: -13.75 + 13.75 = 0.00
0.00 + -0.5x + x2 = 0 + 13.75
-0.5x + x2 = 0 + 13.75

Combine like terms: 0 + 13.75 = 13.75
-0.5x + x2 = 13.75

The x term is -0.5x.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5x + 0.0625 + x2 = 13.75 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 13.75 + 0.0625

Combine like terms: 13.75 + 0.0625 = 13.8125
0.0625 + -0.5x + x2 = 13.8125

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 13.8125

Calculate the square root of the right side: 3.716517187

Break this problem into two subproblems by setting 
(x + -0.25) equal to 3.716517187 and -3.716517187.

Subproblem 1

x + -0.25 = 3.716517187 Simplifying x + -0.25 = 3.716517187 Reorder the terms: -0.25 + x = 3.716517187 Solving -0.25 + x = 3.716517187 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = 3.716517187 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 3.716517187 + 0.25 x = 3.716517187 + 0.25 Combine like terms: 3.716517187 + 0.25 = 3.966517187 x = 3.966517187 Simplifying x = 3.966517187

Subproblem 2

x + -0.25 = -3.716517187 Simplifying x + -0.25 = -3.716517187 Reorder the terms: -0.25 + x = -3.716517187 Solving -0.25 + x = -3.716517187 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = -3.716517187 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -3.716517187 + 0.25 x = -3.716517187 + 0.25 Combine like terms: -3.716517187 + 0.25 = -3.466517187 x = -3.466517187 Simplifying x = -3.466517187

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.966517187, -3.466517187}

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