x^2-4x-61=0

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Solution for x^2-4x-61=0 equation:


Simplifying
x2 + -4x + -61 = 0

Reorder the terms:
-61 + -4x + x2 = 0

Solving
-61 + -4x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '61' to each side of the equation.
-61 + -4x + 61 + x2 = 0 + 61

Reorder the terms:
-61 + 61 + -4x + x2 = 0 + 61

Combine like terms: -61 + 61 = 0
0 + -4x + x2 = 0 + 61
-4x + x2 = 0 + 61

Combine like terms: 0 + 61 = 61
-4x + x2 = 61

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 61 + 4

Reorder the terms:
4 + -4x + x2 = 61 + 4

Combine like terms: 61 + 4 = 65
4 + -4x + x2 = 65

Factor a perfect square on the left side:
(x + -2)(x + -2) = 65

Calculate the square root of the right side: 8.062257748

Break this problem into two subproblems by setting 
(x + -2) equal to 8.062257748 and -8.062257748.

Subproblem 1

x + -2 = 8.062257748 Simplifying x + -2 = 8.062257748 Reorder the terms: -2 + x = 8.062257748 Solving -2 + x = 8.062257748 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 8.062257748 + 2 Combine like terms: -2 + 2 = 0 0 + x = 8.062257748 + 2 x = 8.062257748 + 2 Combine like terms: 8.062257748 + 2 = 10.062257748 x = 10.062257748 Simplifying x = 10.062257748

Subproblem 2

x + -2 = -8.062257748 Simplifying x + -2 = -8.062257748 Reorder the terms: -2 + x = -8.062257748 Solving -2 + x = -8.062257748 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -8.062257748 + 2 Combine like terms: -2 + 2 = 0 0 + x = -8.062257748 + 2 x = -8.062257748 + 2 Combine like terms: -8.062257748 + 2 = -6.062257748 x = -6.062257748 Simplifying x = -6.062257748

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.062257748, -6.062257748}

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