x^2-71=-6x

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Solution for x^2-71=-6x equation:


Simplifying
x2 + -71 = -6x

Reorder the terms:
-71 + x2 = -6x

Solving
-71 + x2 = -6x

Solving for variable 'x'.

Reorder the terms:
-71 + 6x + x2 = -6x + 6x

Combine like terms: -6x + 6x = 0
-71 + 6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '71' to each side of the equation.
-71 + 6x + 71 + x2 = 0 + 71

Reorder the terms:
-71 + 71 + 6x + x2 = 0 + 71

Combine like terms: -71 + 71 = 0
0 + 6x + x2 = 0 + 71
6x + x2 = 0 + 71

Combine like terms: 0 + 71 = 71
6x + x2 = 71

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 71 + 9

Reorder the terms:
9 + 6x + x2 = 71 + 9

Combine like terms: 71 + 9 = 80
9 + 6x + x2 = 80

Factor a perfect square on the left side:
(x + 3)(x + 3) = 80

Calculate the square root of the right side: 8.94427191

Break this problem into two subproblems by setting 
(x + 3) equal to 8.94427191 and -8.94427191.

Subproblem 1

x + 3 = 8.94427191 Simplifying x + 3 = 8.94427191 Reorder the terms: 3 + x = 8.94427191 Solving 3 + x = 8.94427191 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 8.94427191 + -3 Combine like terms: 3 + -3 = 0 0 + x = 8.94427191 + -3 x = 8.94427191 + -3 Combine like terms: 8.94427191 + -3 = 5.94427191 x = 5.94427191 Simplifying x = 5.94427191

Subproblem 2

x + 3 = -8.94427191 Simplifying x + 3 = -8.94427191 Reorder the terms: 3 + x = -8.94427191 Solving 3 + x = -8.94427191 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -8.94427191 + -3 Combine like terms: 3 + -3 = 0 0 + x = -8.94427191 + -3 x = -8.94427191 + -3 Combine like terms: -8.94427191 + -3 = -11.94427191 x = -11.94427191 Simplifying x = -11.94427191

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.94427191, -11.94427191}

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