8x^2-22x-5=0

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Solution for 8x^2-22x-5=0 equation:


Simplifying
8x2 + -22x + -5 = 0

Reorder the terms:
-5 + -22x + 8x2 = 0

Solving
-5 + -22x + 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'.
-0.625 + -2.75x + x2 = 0

Move the constant term to the right:

Add '0.625' to each side of the equation.
-0.625 + -2.75x + 0.625 + x2 = 0 + 0.625

Reorder the terms:
-0.625 + 0.625 + -2.75x + x2 = 0 + 0.625

Combine like terms: -0.625 + 0.625 = 0.000
0.000 + -2.75x + x2 = 0 + 0.625
-2.75x + x2 = 0 + 0.625

Combine like terms: 0 + 0.625 = 0.625
-2.75x + x2 = 0.625

The x term is -2.75x.  Take half its coefficient (-1.375).
Square it (1.890625) and add it to both sides.

Add '1.890625' to each side of the equation.
-2.75x + 1.890625 + x2 = 0.625 + 1.890625

Reorder the terms:
1.890625 + -2.75x + x2 = 0.625 + 1.890625

Combine like terms: 0.625 + 1.890625 = 2.515625
1.890625 + -2.75x + x2 = 2.515625

Factor a perfect square on the left side:
(x + -1.375)(x + -1.375) = 2.515625

Calculate the square root of the right side: 1.586072193

Break this problem into two subproblems by setting 
(x + -1.375) equal to 1.586072193 and -1.586072193.

Subproblem 1

x + -1.375 = 1.586072193 Simplifying x + -1.375 = 1.586072193 Reorder the terms: -1.375 + x = 1.586072193 Solving -1.375 + x = 1.586072193 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.375' to each side of the equation. -1.375 + 1.375 + x = 1.586072193 + 1.375 Combine like terms: -1.375 + 1.375 = 0.000 0.000 + x = 1.586072193 + 1.375 x = 1.586072193 + 1.375 Combine like terms: 1.586072193 + 1.375 = 2.961072193 x = 2.961072193 Simplifying x = 2.961072193

Subproblem 2

x + -1.375 = -1.586072193 Simplifying x + -1.375 = -1.586072193 Reorder the terms: -1.375 + x = -1.586072193 Solving -1.375 + x = -1.586072193 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.375' to each side of the equation. -1.375 + 1.375 + x = -1.586072193 + 1.375 Combine like terms: -1.375 + 1.375 = 0.000 0.000 + x = -1.586072193 + 1.375 x = -1.586072193 + 1.375 Combine like terms: -1.586072193 + 1.375 = -0.211072193 x = -0.211072193 Simplifying x = -0.211072193

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.961072193, -0.211072193}

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