x^2+2x-1=36

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Solution for x^2+2x-1=36 equation:


Simplifying
x2 + 2x + -1 = 36

Reorder the terms:
-1 + 2x + x2 = 36

Solving
-1 + 2x + x2 = 36

Solving for variable 'x'.

Reorder the terms:
-1 + -36 + 2x + x2 = 36 + -36

Combine like terms: -1 + -36 = -37
-37 + 2x + x2 = 36 + -36

Combine like terms: 36 + -36 = 0
-37 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '37' to each side of the equation.
-37 + 2x + 37 + x2 = 0 + 37

Reorder the terms:
-37 + 37 + 2x + x2 = 0 + 37

Combine like terms: -37 + 37 = 0
0 + 2x + x2 = 0 + 37
2x + x2 = 0 + 37

Combine like terms: 0 + 37 = 37
2x + x2 = 37

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 37 + 1

Reorder the terms:
1 + 2x + x2 = 37 + 1

Combine like terms: 37 + 1 = 38
1 + 2x + x2 = 38

Factor a perfect square on the left side:
(x + 1)(x + 1) = 38

Calculate the square root of the right side: 6.164414003

Break this problem into two subproblems by setting 
(x + 1) equal to 6.164414003 and -6.164414003.

Subproblem 1

x + 1 = 6.164414003 Simplifying x + 1 = 6.164414003 Reorder the terms: 1 + x = 6.164414003 Solving 1 + x = 6.164414003 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 6.164414003 + -1 Combine like terms: 1 + -1 = 0 0 + x = 6.164414003 + -1 x = 6.164414003 + -1 Combine like terms: 6.164414003 + -1 = 5.164414003 x = 5.164414003 Simplifying x = 5.164414003

Subproblem 2

x + 1 = -6.164414003 Simplifying x + 1 = -6.164414003 Reorder the terms: 1 + x = -6.164414003 Solving 1 + x = -6.164414003 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -6.164414003 + -1 Combine like terms: 1 + -1 = 0 0 + x = -6.164414003 + -1 x = -6.164414003 + -1 Combine like terms: -6.164414003 + -1 = -7.164414003 x = -7.164414003 Simplifying x = -7.164414003

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.164414003, -7.164414003}

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