8x^2-32x-247=0

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Solution for 8x^2-32x-247=0 equation:


Simplifying
8x2 + -32x + -247 = 0

Reorder the terms:
-247 + -32x + 8x2 = 0

Solving
-247 + -32x + 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'.
-30.875 + -4x + x2 = 0

Move the constant term to the right:

Add '30.875' to each side of the equation.
-30.875 + -4x + 30.875 + x2 = 0 + 30.875

Reorder the terms:
-30.875 + 30.875 + -4x + x2 = 0 + 30.875

Combine like terms: -30.875 + 30.875 = 0.000
0.000 + -4x + x2 = 0 + 30.875
-4x + x2 = 0 + 30.875

Combine like terms: 0 + 30.875 = 30.875
-4x + x2 = 30.875

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 30.875 + 4

Reorder the terms:
4 + -4x + x2 = 30.875 + 4

Combine like terms: 30.875 + 4 = 34.875
4 + -4x + x2 = 34.875

Factor a perfect square on the left side:
(x + -2)(x + -2) = 34.875

Calculate the square root of the right side: 5.905505906

Break this problem into two subproblems by setting 
(x + -2) equal to 5.905505906 and -5.905505906.

Subproblem 1

x + -2 = 5.905505906 Simplifying x + -2 = 5.905505906 Reorder the terms: -2 + x = 5.905505906 Solving -2 + x = 5.905505906 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 5.905505906 + 2 Combine like terms: -2 + 2 = 0 0 + x = 5.905505906 + 2 x = 5.905505906 + 2 Combine like terms: 5.905505906 + 2 = 7.905505906 x = 7.905505906 Simplifying x = 7.905505906

Subproblem 2

x + -2 = -5.905505906 Simplifying x + -2 = -5.905505906 Reorder the terms: -2 + x = -5.905505906 Solving -2 + x = -5.905505906 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -5.905505906 + 2 Combine like terms: -2 + 2 = 0 0 + x = -5.905505906 + 2 x = -5.905505906 + 2 Combine like terms: -5.905505906 + 2 = -3.905505906 x = -3.905505906 Simplifying x = -3.905505906

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.905505906, -3.905505906}

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