8x^2+52x+7=0

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Solution for 8x^2+52x+7=0 equation:


Simplifying
8x2 + 52x + 7 = 0

Reorder the terms:
7 + 52x + 8x2 = 0

Solving
7 + 52x + 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'.
0.875 + 6.5x + x2 = 0

Move the constant term to the right:

Add '-0.875' to each side of the equation.
0.875 + 6.5x + -0.875 + x2 = 0 + -0.875

Reorder the terms:
0.875 + -0.875 + 6.5x + x2 = 0 + -0.875

Combine like terms: 0.875 + -0.875 = 0.000
0.000 + 6.5x + x2 = 0 + -0.875
6.5x + x2 = 0 + -0.875

Combine like terms: 0 + -0.875 = -0.875
6.5x + x2 = -0.875

The x term is 6.5x.  Take half its coefficient (3.25).
Square it (10.5625) and add it to both sides.

Add '10.5625' to each side of the equation.
6.5x + 10.5625 + x2 = -0.875 + 10.5625

Reorder the terms:
10.5625 + 6.5x + x2 = -0.875 + 10.5625

Combine like terms: -0.875 + 10.5625 = 9.6875
10.5625 + 6.5x + x2 = 9.6875

Factor a perfect square on the left side:
(x + 3.25)(x + 3.25) = 9.6875

Calculate the square root of the right side: 3.112474899

Break this problem into two subproblems by setting 
(x + 3.25) equal to 3.112474899 and -3.112474899.

Subproblem 1

x + 3.25 = 3.112474899 Simplifying x + 3.25 = 3.112474899 Reorder the terms: 3.25 + x = 3.112474899 Solving 3.25 + x = 3.112474899 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + x = 3.112474899 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + x = 3.112474899 + -3.25 x = 3.112474899 + -3.25 Combine like terms: 3.112474899 + -3.25 = -0.137525101 x = -0.137525101 Simplifying x = -0.137525101

Subproblem 2

x + 3.25 = -3.112474899 Simplifying x + 3.25 = -3.112474899 Reorder the terms: 3.25 + x = -3.112474899 Solving 3.25 + x = -3.112474899 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + x = -3.112474899 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + x = -3.112474899 + -3.25 x = -3.112474899 + -3.25 Combine like terms: -3.112474899 + -3.25 = -6.362474899 x = -6.362474899 Simplifying x = -6.362474899

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.137525101, -6.362474899}

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