4x^2-8x-71=0

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Solution for 4x^2-8x-71=0 equation:


Simplifying
4x2 + -8x + -71 = 0

Reorder the terms:
-71 + -8x + 4x2 = 0

Solving
-71 + -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'.
-17.75 + -2x + x2 = 0

Move the constant term to the right:

Add '17.75' to each side of the equation.
-17.75 + -2x + 17.75 + x2 = 0 + 17.75

Reorder the terms:
-17.75 + 17.75 + -2x + x2 = 0 + 17.75

Combine like terms: -17.75 + 17.75 = 0.00
0.00 + -2x + x2 = 0 + 17.75
-2x + x2 = 0 + 17.75

Combine like terms: 0 + 17.75 = 17.75
-2x + x2 = 17.75

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 = 17.75 + 1

Reorder the terms:
1 + -2x + x2 = 17.75 + 1

Combine like terms: 17.75 + 1 = 18.75
1 + -2x + x2 = 18.75

Factor a perfect square on the left side:
(x + -1)(x + -1) = 18.75

Calculate the square root of the right side: 4.330127019

Break this problem into two subproblems by setting 
(x + -1) equal to 4.330127019 and -4.330127019.

Subproblem 1

x + -1 = 4.330127019 Simplifying x + -1 = 4.330127019 Reorder the terms: -1 + x = 4.330127019 Solving -1 + x = 4.330127019 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 = 4.330127019 + 1 Combine like terms: -1 + 1 = 0 0 + x = 4.330127019 + 1 x = 4.330127019 + 1 Combine like terms: 4.330127019 + 1 = 5.330127019 x = 5.330127019 Simplifying x = 5.330127019

Subproblem 2

x + -1 = -4.330127019 Simplifying x + -1 = -4.330127019 Reorder the terms: -1 + x = -4.330127019 Solving -1 + x = -4.330127019 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 = -4.330127019 + 1 Combine like terms: -1 + 1 = 0 0 + x = -4.330127019 + 1 x = -4.330127019 + 1 Combine like terms: -4.330127019 + 1 = -3.330127019 x = -3.330127019 Simplifying x = -3.330127019

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.330127019, -3.330127019}

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