8x^2+16x-23=0

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Solution for 8x^2+16x-23=0 equation:


Simplifying
8x2 + 16x + -23 = 0

Reorder the terms:
-23 + 16x + 8x2 = 0

Solving
-23 + 16x + 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'.
-2.875 + 2x + x2 = 0

Move the constant term to the right:

Add '2.875' to each side of the equation.
-2.875 + 2x + 2.875 + x2 = 0 + 2.875

Reorder the terms:
-2.875 + 2.875 + 2x + x2 = 0 + 2.875

Combine like terms: -2.875 + 2.875 = 0.000
0.000 + 2x + x2 = 0 + 2.875
2x + x2 = 0 + 2.875

Combine like terms: 0 + 2.875 = 2.875
2x + x2 = 2.875

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 = 2.875 + 1

Reorder the terms:
1 + 2x + x2 = 2.875 + 1

Combine like terms: 2.875 + 1 = 3.875
1 + 2x + x2 = 3.875

Factor a perfect square on the left side:
(x + 1)(x + 1) = 3.875

Calculate the square root of the right side: 1.968501969

Break this problem into two subproblems by setting 
(x + 1) equal to 1.968501969 and -1.968501969.

Subproblem 1

x + 1 = 1.968501969 Simplifying x + 1 = 1.968501969 Reorder the terms: 1 + x = 1.968501969 Solving 1 + x = 1.968501969 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 = 1.968501969 + -1 Combine like terms: 1 + -1 = 0 0 + x = 1.968501969 + -1 x = 1.968501969 + -1 Combine like terms: 1.968501969 + -1 = 0.968501969 x = 0.968501969 Simplifying x = 0.968501969

Subproblem 2

x + 1 = -1.968501969 Simplifying x + 1 = -1.968501969 Reorder the terms: 1 + x = -1.968501969 Solving 1 + x = -1.968501969 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 = -1.968501969 + -1 Combine like terms: 1 + -1 = 0 0 + x = -1.968501969 + -1 x = -1.968501969 + -1 Combine like terms: -1.968501969 + -1 = -2.968501969 x = -2.968501969 Simplifying x = -2.968501969

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.968501969, -2.968501969}

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