x^2+4x-61=6

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Solution for x^2+4x-61=6 equation:


Simplifying
x2 + 4x + -61 = 6

Reorder the terms:
-61 + 4x + x2 = 6

Solving
-61 + 4x + x2 = 6

Solving for variable 'x'.

Reorder the terms:
-61 + -6 + 4x + x2 = 6 + -6

Combine like terms: -61 + -6 = -67
-67 + 4x + x2 = 6 + -6

Combine like terms: 6 + -6 = 0
-67 + 4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '67' to each side of the equation.
-67 + 4x + 67 + x2 = 0 + 67

Reorder the terms:
-67 + 67 + 4x + x2 = 0 + 67

Combine like terms: -67 + 67 = 0
0 + 4x + x2 = 0 + 67
4x + x2 = 0 + 67

Combine like terms: 0 + 67 = 67
4x + x2 = 67

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 = 67 + 4

Reorder the terms:
4 + 4x + x2 = 67 + 4

Combine like terms: 67 + 4 = 71
4 + 4x + x2 = 71

Factor a perfect square on the left side:
(x + 2)(x + 2) = 71

Calculate the square root of the right side: 8.426149773

Break this problem into two subproblems by setting 
(x + 2) equal to 8.426149773 and -8.426149773.

Subproblem 1

x + 2 = 8.426149773 Simplifying x + 2 = 8.426149773 Reorder the terms: 2 + x = 8.426149773 Solving 2 + x = 8.426149773 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 = 8.426149773 + -2 Combine like terms: 2 + -2 = 0 0 + x = 8.426149773 + -2 x = 8.426149773 + -2 Combine like terms: 8.426149773 + -2 = 6.426149773 x = 6.426149773 Simplifying x = 6.426149773

Subproblem 2

x + 2 = -8.426149773 Simplifying x + 2 = -8.426149773 Reorder the terms: 2 + x = -8.426149773 Solving 2 + x = -8.426149773 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 = -8.426149773 + -2 Combine like terms: 2 + -2 = 0 0 + x = -8.426149773 + -2 x = -8.426149773 + -2 Combine like terms: -8.426149773 + -2 = -10.426149773 x = -10.426149773 Simplifying x = -10.426149773

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.426149773, -10.426149773}

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