x^2+8x-731=0

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Solution for x^2+8x-731=0 equation:


Simplifying
x2 + 8x + -731 = 0

Reorder the terms:
-731 + 8x + x2 = 0

Solving
-731 + 8x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '731' to each side of the equation.
-731 + 8x + 731 + x2 = 0 + 731

Reorder the terms:
-731 + 731 + 8x + x2 = 0 + 731

Combine like terms: -731 + 731 = 0
0 + 8x + x2 = 0 + 731
8x + x2 = 0 + 731

Combine like terms: 0 + 731 = 731
8x + x2 = 731

The x term is 8x.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x + 16 + x2 = 731 + 16

Reorder the terms:
16 + 8x + x2 = 731 + 16

Combine like terms: 731 + 16 = 747
16 + 8x + x2 = 747

Factor a perfect square on the left side:
(x + 4)(x + 4) = 747

Calculate the square root of the right side: 27.331300737

Break this problem into two subproblems by setting 
(x + 4) equal to 27.331300737 and -27.331300737.

Subproblem 1

x + 4 = 27.331300737 Simplifying x + 4 = 27.331300737 Reorder the terms: 4 + x = 27.331300737 Solving 4 + x = 27.331300737 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 27.331300737 + -4 Combine like terms: 4 + -4 = 0 0 + x = 27.331300737 + -4 x = 27.331300737 + -4 Combine like terms: 27.331300737 + -4 = 23.331300737 x = 23.331300737 Simplifying x = 23.331300737

Subproblem 2

x + 4 = -27.331300737 Simplifying x + 4 = -27.331300737 Reorder the terms: 4 + x = -27.331300737 Solving 4 + x = -27.331300737 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = -27.331300737 + -4 Combine like terms: 4 + -4 = 0 0 + x = -27.331300737 + -4 x = -27.331300737 + -4 Combine like terms: -27.331300737 + -4 = -31.331300737 x = -31.331300737 Simplifying x = -31.331300737

Solution

The solution to the problem is based on the solutions from the subproblems. x = {23.331300737, -31.331300737}

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