x^2+66x-1=0

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Solution for x^2+66x-1=0 equation:


Simplifying
x2 + 66x + -1 = 0

Reorder the terms:
-1 + 66x + x2 = 0

Solving
-1 + 66x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 66x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + 66x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 66x + x2 = 0 + 1
66x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
66x + x2 = 1

The x term is 66x.  Take half its coefficient (33).
Square it (1089) and add it to both sides.

Add '1089' to each side of the equation.
66x + 1089 + x2 = 1 + 1089

Reorder the terms:
1089 + 66x + x2 = 1 + 1089

Combine like terms: 1 + 1089 = 1090
1089 + 66x + x2 = 1090

Factor a perfect square on the left side:
(x + 33)(x + 33) = 1090

Calculate the square root of the right side: 33.015148038

Break this problem into two subproblems by setting 
(x + 33) equal to 33.015148038 and -33.015148038.

Subproblem 1

x + 33 = 33.015148038 Simplifying x + 33 = 33.015148038 Reorder the terms: 33 + x = 33.015148038 Solving 33 + x = 33.015148038 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-33' to each side of the equation. 33 + -33 + x = 33.015148038 + -33 Combine like terms: 33 + -33 = 0 0 + x = 33.015148038 + -33 x = 33.015148038 + -33 Combine like terms: 33.015148038 + -33 = 0.015148038 x = 0.015148038 Simplifying x = 0.015148038

Subproblem 2

x + 33 = -33.015148038 Simplifying x + 33 = -33.015148038 Reorder the terms: 33 + x = -33.015148038 Solving 33 + x = -33.015148038 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-33' to each side of the equation. 33 + -33 + x = -33.015148038 + -33 Combine like terms: 33 + -33 = 0 0 + x = -33.015148038 + -33 x = -33.015148038 + -33 Combine like terms: -33.015148038 + -33 = -66.015148038 x = -66.015148038 Simplifying x = -66.015148038

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.015148038, -66.015148038}

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