4x^2-4x-77=0

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Solution for 4x^2-4x-77=0 equation:


Simplifying
4x2 + -4x + -77 = 0

Reorder the terms:
-77 + -4x + 4x2 = 0

Solving
-77 + -4x + 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'.
-19.25 + -1x + x2 = 0

Move the constant term to the right:

Add '19.25' to each side of the equation.
-19.25 + -1x + 19.25 + x2 = 0 + 19.25

Reorder the terms:
-19.25 + 19.25 + -1x + x2 = 0 + 19.25

Combine like terms: -19.25 + 19.25 = 0.00
0.00 + -1x + x2 = 0 + 19.25
-1x + x2 = 0 + 19.25

Combine like terms: 0 + 19.25 = 19.25
-1x + x2 = 19.25

The x term is -1x.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 19.25 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 19.25 + 0.25

Combine like terms: 19.25 + 0.25 = 19.5
0.25 + -1x + x2 = 19.5

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 19.5

Calculate the square root of the right side: 4.415880433

Break this problem into two subproblems by setting 
(x + -0.5) equal to 4.415880433 and -4.415880433.

Subproblem 1

x + -0.5 = 4.415880433 Simplifying x + -0.5 = 4.415880433 Reorder the terms: -0.5 + x = 4.415880433 Solving -0.5 + x = 4.415880433 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = 4.415880433 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 4.415880433 + 0.5 x = 4.415880433 + 0.5 Combine like terms: 4.415880433 + 0.5 = 4.915880433 x = 4.915880433 Simplifying x = 4.915880433

Subproblem 2

x + -0.5 = -4.415880433 Simplifying x + -0.5 = -4.415880433 Reorder the terms: -0.5 + x = -4.415880433 Solving -0.5 + x = -4.415880433 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = -4.415880433 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -4.415880433 + 0.5 x = -4.415880433 + 0.5 Combine like terms: -4.415880433 + 0.5 = -3.915880433 x = -3.915880433 Simplifying x = -3.915880433

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.915880433, -3.915880433}

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