0=6x+x^2-77

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Solution for 0=6x+x^2-77 equation:


Simplifying
0 = 6x + x2 + -77

Reorder the terms:
0 = -77 + 6x + x2

Solving
0 = -77 + 6x + x2

Solving for variable 'x'.

Combine like terms: 0 + 77 = 77
77 + -6x + -1x2 = -77 + 6x + x2 + 77 + -6x + -1x2

Reorder the terms:
77 + -6x + -1x2 = -77 + 77 + 6x + -6x + x2 + -1x2

Combine like terms: -77 + 77 = 0
77 + -6x + -1x2 = 0 + 6x + -6x + x2 + -1x2
77 + -6x + -1x2 = 6x + -6x + x2 + -1x2

Combine like terms: 6x + -6x = 0
77 + -6x + -1x2 = 0 + x2 + -1x2
77 + -6x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
77 + -6x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-77 + 6x + x2 = 0

Move the constant term to the right:

Add '77' to each side of the equation.
-77 + 6x + 77 + x2 = 0 + 77

Reorder the terms:
-77 + 77 + 6x + x2 = 0 + 77

Combine like terms: -77 + 77 = 0
0 + 6x + x2 = 0 + 77
6x + x2 = 0 + 77

Combine like terms: 0 + 77 = 77
6x + x2 = 77

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 = 77 + 9

Reorder the terms:
9 + 6x + x2 = 77 + 9

Combine like terms: 77 + 9 = 86
9 + 6x + x2 = 86

Factor a perfect square on the left side:
(x + 3)(x + 3) = 86

Calculate the square root of the right side: 9.273618495

Break this problem into two subproblems by setting 
(x + 3) equal to 9.273618495 and -9.273618495.

Subproblem 1

x + 3 = 9.273618495 Simplifying x + 3 = 9.273618495 Reorder the terms: 3 + x = 9.273618495 Solving 3 + x = 9.273618495 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 = 9.273618495 + -3 Combine like terms: 3 + -3 = 0 0 + x = 9.273618495 + -3 x = 9.273618495 + -3 Combine like terms: 9.273618495 + -3 = 6.273618495 x = 6.273618495 Simplifying x = 6.273618495

Subproblem 2

x + 3 = -9.273618495 Simplifying x + 3 = -9.273618495 Reorder the terms: 3 + x = -9.273618495 Solving 3 + x = -9.273618495 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 = -9.273618495 + -3 Combine like terms: 3 + -3 = 0 0 + x = -9.273618495 + -3 x = -9.273618495 + -3 Combine like terms: -9.273618495 + -3 = -12.273618495 x = -12.273618495 Simplifying x = -12.273618495

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.273618495, -12.273618495}

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