8x^2+8x-83=0

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Solution for 8x^2+8x-83=0 equation:


Simplifying
8x2 + 8x + -83 = 0

Reorder the terms:
-83 + 8x + 8x2 = 0

Solving
-83 + 8x + 8x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
8 the coefficient of the squared term: 

Divide each side by '8'.
-10.375 + x + x2 = 0

Move the constant term to the right:

Add '10.375' to each side of the equation.
-10.375 + x + 10.375 + x2 = 0 + 10.375

Reorder the terms:
-10.375 + 10.375 + x + x2 = 0 + 10.375

Combine like terms: -10.375 + 10.375 = 0.000
0.000 + x + x2 = 0 + 10.375
x + x2 = 0 + 10.375

Combine like terms: 0 + 10.375 = 10.375
x + x2 = 10.375

The x term is x.  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.
 + 0.25 + x2 = 10.375 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 10.375 + 0.25

Combine like terms: 10.375 + 0.25 = 10.625
1.25 + x2 = 10.625

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 10.625

Calculate the square root of the right side: 3.259601203

Break this problem into two subproblems by setting 
(x + 0.5) equal to 3.259601203 and -3.259601203.

Subproblem 1

x + 0.5 = 3.259601203 Simplifying x + 0.5 = 3.259601203 Reorder the terms: 0.5 + x = 3.259601203 Solving 0.5 + x = 3.259601203 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 = 3.259601203 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 3.259601203 + -0.5 x = 3.259601203 + -0.5 Combine like terms: 3.259601203 + -0.5 = 2.759601203 x = 2.759601203 Simplifying x = 2.759601203

Subproblem 2

x + 0.5 = -3.259601203 Simplifying x + 0.5 = -3.259601203 Reorder the terms: 0.5 + x = -3.259601203 Solving 0.5 + x = -3.259601203 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 = -3.259601203 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -3.259601203 + -0.5 x = -3.259601203 + -0.5 Combine like terms: -3.259601203 + -0.5 = -3.759601203 x = -3.759601203 Simplifying x = -3.759601203

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.759601203, -3.759601203}

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