8x^2+5x=23

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Solution for 8x^2+5x=23 equation:


Simplifying
8x2 + 5x = 23

Reorder the terms:
5x + 8x2 = 23

Solving
5x + 8x2 = 23

Solving for variable 'x'.

Reorder the terms:
-23 + 5x + 8x2 = 23 + -23

Combine like terms: 23 + -23 = 0
-23 + 5x + 8x2 = 0

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

Divide each side by '8'.
-2.875 + 0.625x + x2 = 0

Move the constant term to the right:

Add '2.875' to each side of the equation.
-2.875 + 0.625x + 2.875 + x2 = 0 + 2.875

Reorder the terms:
-2.875 + 2.875 + 0.625x + x2 = 0 + 2.875

Combine like terms: -2.875 + 2.875 = 0.000
0.000 + 0.625x + x2 = 0 + 2.875
0.625x + x2 = 0 + 2.875

Combine like terms: 0 + 2.875 = 2.875
0.625x + x2 = 2.875

The x term is 0.625x.  Take half its coefficient (0.3125).
Square it (0.09765625) and add it to both sides.

Add '0.09765625' to each side of the equation.
0.625x + 0.09765625 + x2 = 2.875 + 0.09765625

Reorder the terms:
0.09765625 + 0.625x + x2 = 2.875 + 0.09765625

Combine like terms: 2.875 + 0.09765625 = 2.97265625
0.09765625 + 0.625x + x2 = 2.97265625

Factor a perfect square on the left side:
(x + 0.3125)(x + 0.3125) = 2.97265625

Calculate the square root of the right side: 1.724139278

Break this problem into two subproblems by setting 
(x + 0.3125) equal to 1.724139278 and -1.724139278.

Subproblem 1

x + 0.3125 = 1.724139278 Simplifying x + 0.3125 = 1.724139278 Reorder the terms: 0.3125 + x = 1.724139278 Solving 0.3125 + x = 1.724139278 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3125' to each side of the equation. 0.3125 + -0.3125 + x = 1.724139278 + -0.3125 Combine like terms: 0.3125 + -0.3125 = 0.0000 0.0000 + x = 1.724139278 + -0.3125 x = 1.724139278 + -0.3125 Combine like terms: 1.724139278 + -0.3125 = 1.411639278 x = 1.411639278 Simplifying x = 1.411639278

Subproblem 2

x + 0.3125 = -1.724139278 Simplifying x + 0.3125 = -1.724139278 Reorder the terms: 0.3125 + x = -1.724139278 Solving 0.3125 + x = -1.724139278 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3125' to each side of the equation. 0.3125 + -0.3125 + x = -1.724139278 + -0.3125 Combine like terms: 0.3125 + -0.3125 = 0.0000 0.0000 + x = -1.724139278 + -0.3125 x = -1.724139278 + -0.3125 Combine like terms: -1.724139278 + -0.3125 = -2.036639278 x = -2.036639278 Simplifying x = -2.036639278

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.411639278, -2.036639278}

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