0=x^2+6x-76

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Solution for 0=x^2+6x-76 equation:


Simplifying
0 = x2 + 6x + -76

Reorder the terms:
0 = -76 + 6x + x2

Solving
0 = -76 + 6x + x2

Solving for variable 'x'.

Combine like terms: 0 + 76 = 76
76 + -6x + -1x2 = -76 + 6x + x2 + 76 + -6x + -1x2

Reorder the terms:
76 + -6x + -1x2 = -76 + 76 + 6x + -6x + x2 + -1x2

Combine like terms: -76 + 76 = 0
76 + -6x + -1x2 = 0 + 6x + -6x + x2 + -1x2
76 + -6x + -1x2 = 6x + -6x + x2 + -1x2

Combine like terms: 6x + -6x = 0
76 + -6x + -1x2 = 0 + x2 + -1x2
76 + -6x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
76 + -6x + -1x2 = 0

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

Divide each side by '-1'.
-76 + 6x + x2 = 0

Move the constant term to the right:

Add '76' to each side of the equation.
-76 + 6x + 76 + x2 = 0 + 76

Reorder the terms:
-76 + 76 + 6x + x2 = 0 + 76

Combine like terms: -76 + 76 = 0
0 + 6x + x2 = 0 + 76
6x + x2 = 0 + 76

Combine like terms: 0 + 76 = 76
6x + x2 = 76

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 = 76 + 9

Reorder the terms:
9 + 6x + x2 = 76 + 9

Combine like terms: 76 + 9 = 85
9 + 6x + x2 = 85

Factor a perfect square on the left side:
(x + 3)(x + 3) = 85

Calculate the square root of the right side: 9.219544457

Break this problem into two subproblems by setting 
(x + 3) equal to 9.219544457 and -9.219544457.

Subproblem 1

x + 3 = 9.219544457 Simplifying x + 3 = 9.219544457 Reorder the terms: 3 + x = 9.219544457 Solving 3 + x = 9.219544457 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 = 9.219544457 + -3 Combine like terms: 3 + -3 = 0 0 + x = 9.219544457 + -3 x = 9.219544457 + -3 Combine like terms: 9.219544457 + -3 = 6.219544457 x = 6.219544457 Simplifying x = 6.219544457

Subproblem 2

x + 3 = -9.219544457 Simplifying x + 3 = -9.219544457 Reorder the terms: 3 + x = -9.219544457 Solving 3 + x = -9.219544457 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 = -9.219544457 + -3 Combine like terms: 3 + -3 = 0 0 + x = -9.219544457 + -3 x = -9.219544457 + -3 Combine like terms: -9.219544457 + -3 = -12.219544457 x = -12.219544457 Simplifying x = -12.219544457

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.219544457, -12.219544457}

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