x^2-6x-76=3

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Solution for x^2-6x-76=3 equation:


Simplifying
x2 + -6x + -76 = 3

Reorder the terms:
-76 + -6x + x2 = 3

Solving
-76 + -6x + x2 = 3

Solving for variable 'x'.

Reorder the terms:
-76 + -3 + -6x + x2 = 3 + -3

Combine like terms: -76 + -3 = -79
-79 + -6x + x2 = 3 + -3

Combine like terms: 3 + -3 = 0
-79 + -6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '79' to each side of the equation.
-79 + -6x + 79 + x2 = 0 + 79

Reorder the terms:
-79 + 79 + -6x + x2 = 0 + 79

Combine like terms: -79 + 79 = 0
0 + -6x + x2 = 0 + 79
-6x + x2 = 0 + 79

Combine like terms: 0 + 79 = 79
-6x + x2 = 79

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 = 79 + 9

Reorder the terms:
9 + -6x + x2 = 79 + 9

Combine like terms: 79 + 9 = 88
9 + -6x + x2 = 88

Factor a perfect square on the left side:
(x + -3)(x + -3) = 88

Calculate the square root of the right side: 9.38083152

Break this problem into two subproblems by setting 
(x + -3) equal to 9.38083152 and -9.38083152.

Subproblem 1

x + -3 = 9.38083152 Simplifying x + -3 = 9.38083152 Reorder the terms: -3 + x = 9.38083152 Solving -3 + x = 9.38083152 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 = 9.38083152 + 3 Combine like terms: -3 + 3 = 0 0 + x = 9.38083152 + 3 x = 9.38083152 + 3 Combine like terms: 9.38083152 + 3 = 12.38083152 x = 12.38083152 Simplifying x = 12.38083152

Subproblem 2

x + -3 = -9.38083152 Simplifying x + -3 = -9.38083152 Reorder the terms: -3 + x = -9.38083152 Solving -3 + x = -9.38083152 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 = -9.38083152 + 3 Combine like terms: -3 + 3 = 0 0 + x = -9.38083152 + 3 x = -9.38083152 + 3 Combine like terms: -9.38083152 + 3 = -6.38083152 x = -6.38083152 Simplifying x = -6.38083152

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.38083152, -6.38083152}

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