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 = 6.062257748 x = 6.062257748 Simplifying x = 6.062257748

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 = -10.062257748 x = -10.062257748 Simplifying x = -10.062257748

Solution

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

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