8x^2+8x-361=0

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Solution for 8x^2+8x-361=0 equation:


Simplifying
8x2 + 8x + -361 = 0

Reorder the terms:
-361 + 8x + 8x2 = 0

Solving
-361 + 8x + 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'.
-45.125 + x + x2 = 0

Move the constant term to the right:

Add '45.125' to each side of the equation.
-45.125 + x + 45.125 + x2 = 0 + 45.125

Reorder the terms:
-45.125 + 45.125 + x + x2 = 0 + 45.125

Combine like terms: -45.125 + 45.125 = 0.000
0.000 + x + x2 = 0 + 45.125
x + x2 = 0 + 45.125

Combine like terms: 0 + 45.125 = 45.125
x + x2 = 45.125

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 45.125 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 45.125 + 0.25

Combine like terms: 45.125 + 0.25 = 45.375
1.25 + x2 = 45.375

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 45.375

Calculate the square root of the right side: 6.736096793

Break this problem into two subproblems by setting 
(x + 0.5) equal to 6.736096793 and -6.736096793.

Subproblem 1

x + 0.5 = 6.736096793 Simplifying x + 0.5 = 6.736096793 Reorder the terms: 0.5 + x = 6.736096793 Solving 0.5 + x = 6.736096793 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 6.736096793 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 6.736096793 + -0.5 x = 6.736096793 + -0.5 Combine like terms: 6.736096793 + -0.5 = 6.236096793 x = 6.236096793 Simplifying x = 6.236096793

Subproblem 2

x + 0.5 = -6.736096793 Simplifying x + 0.5 = -6.736096793 Reorder the terms: 0.5 + x = -6.736096793 Solving 0.5 + x = -6.736096793 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -6.736096793 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -6.736096793 + -0.5 x = -6.736096793 + -0.5 Combine like terms: -6.736096793 + -0.5 = -7.236096793 x = -7.236096793 Simplifying x = -7.236096793

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.236096793, -7.236096793}

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