4x^2-8x-55=0

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Solution for 4x^2-8x-55=0 equation:


Simplifying
4x2 + -8x + -55 = 0

Reorder the terms:
-55 + -8x + 4x2 = 0

Solving
-55 + -8x + 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 + -2x + x2 = 0

Move the constant term to the right:

Add '13.75' to each side of the equation.
-13.75 + -2x + 13.75 + x2 = 0 + 13.75

Reorder the terms:
-13.75 + 13.75 + -2x + x2 = 0 + 13.75

Combine like terms: -13.75 + 13.75 = 0.00
0.00 + -2x + x2 = 0 + 13.75
-2x + x2 = 0 + 13.75

Combine like terms: 0 + 13.75 = 13.75
-2x + x2 = 13.75

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 13.75 + 1

Reorder the terms:
1 + -2x + x2 = 13.75 + 1

Combine like terms: 13.75 + 1 = 14.75
1 + -2x + x2 = 14.75

Factor a perfect square on the left side:
(x + -1)(x + -1) = 14.75

Calculate the square root of the right side: 3.840572874

Break this problem into two subproblems by setting 
(x + -1) equal to 3.840572874 and -3.840572874.

Subproblem 1

x + -1 = 3.840572874 Simplifying x + -1 = 3.840572874 Reorder the terms: -1 + x = 3.840572874 Solving -1 + x = 3.840572874 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 3.840572874 + 1 Combine like terms: -1 + 1 = 0 0 + x = 3.840572874 + 1 x = 3.840572874 + 1 Combine like terms: 3.840572874 + 1 = 4.840572874 x = 4.840572874 Simplifying x = 4.840572874

Subproblem 2

x + -1 = -3.840572874 Simplifying x + -1 = -3.840572874 Reorder the terms: -1 + x = -3.840572874 Solving -1 + x = -3.840572874 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -3.840572874 + 1 Combine like terms: -1 + 1 = 0 0 + x = -3.840572874 + 1 x = -3.840572874 + 1 Combine like terms: -3.840572874 + 1 = -2.840572874 x = -2.840572874 Simplifying x = -2.840572874

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.840572874, -2.840572874}

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