8x^2+53x-5=0

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Solution for 8x^2+53x-5=0 equation:


Simplifying
8x2 + 53x + -5 = 0

Reorder the terms:
-5 + 53x + 8x2 = 0

Solving
-5 + 53x + 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 + 6.625x + x2 = 0

Move the constant term to the right:

Add '0.625' to each side of the equation.
-0.625 + 6.625x + 0.625 + x2 = 0 + 0.625

Reorder the terms:
-0.625 + 0.625 + 6.625x + x2 = 0 + 0.625

Combine like terms: -0.625 + 0.625 = 0.000
0.000 + 6.625x + x2 = 0 + 0.625
6.625x + x2 = 0 + 0.625

Combine like terms: 0 + 0.625 = 0.625
6.625x + x2 = 0.625

The x term is 6.625x.  Take half its coefficient (3.3125).
Square it (10.97265625) and add it to both sides.

Add '10.97265625' to each side of the equation.
6.625x + 10.97265625 + x2 = 0.625 + 10.97265625

Reorder the terms:
10.97265625 + 6.625x + x2 = 0.625 + 10.97265625

Combine like terms: 0.625 + 10.97265625 = 11.59765625
10.97265625 + 6.625x + x2 = 11.59765625

Factor a perfect square on the left side:
(x + 3.3125)(x + 3.3125) = 11.59765625

Calculate the square root of the right side: 3.405533181

Break this problem into two subproblems by setting 
(x + 3.3125) equal to 3.405533181 and -3.405533181.

Subproblem 1

x + 3.3125 = 3.405533181 Simplifying x + 3.3125 = 3.405533181 Reorder the terms: 3.3125 + x = 3.405533181 Solving 3.3125 + x = 3.405533181 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.3125' to each side of the equation. 3.3125 + -3.3125 + x = 3.405533181 + -3.3125 Combine like terms: 3.3125 + -3.3125 = 0.0000 0.0000 + x = 3.405533181 + -3.3125 x = 3.405533181 + -3.3125 Combine like terms: 3.405533181 + -3.3125 = 0.093033181 x = 0.093033181 Simplifying x = 0.093033181

Subproblem 2

x + 3.3125 = -3.405533181 Simplifying x + 3.3125 = -3.405533181 Reorder the terms: 3.3125 + x = -3.405533181 Solving 3.3125 + x = -3.405533181 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.3125' to each side of the equation. 3.3125 + -3.3125 + x = -3.405533181 + -3.3125 Combine like terms: 3.3125 + -3.3125 = 0.0000 0.0000 + x = -3.405533181 + -3.3125 x = -3.405533181 + -3.3125 Combine like terms: -3.405533181 + -3.3125 = -6.718033181 x = -6.718033181 Simplifying x = -6.718033181

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.093033181, -6.718033181}

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