x^2+2x-4=36

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Solution for x^2+2x-4=36 equation:


Simplifying
x2 + 2x + -4 = 36

Reorder the terms:
-4 + 2x + x2 = 36

Solving
-4 + 2x + x2 = 36

Solving for variable 'x'.

Reorder the terms:
-4 + -36 + 2x + x2 = 36 + -36

Combine like terms: -4 + -36 = -40
-40 + 2x + x2 = 36 + -36

Combine like terms: 36 + -36 = 0
-40 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + 2x + 40 + x2 = 0 + 40

Reorder the terms:
-40 + 40 + 2x + x2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + 2x + x2 = 0 + 40
2x + x2 = 0 + 40

Combine like terms: 0 + 40 = 40
2x + x2 = 40

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 = 40 + 1

Reorder the terms:
1 + 2x + x2 = 40 + 1

Combine like terms: 40 + 1 = 41
1 + 2x + x2 = 41

Factor a perfect square on the left side:
(x + 1)(x + 1) = 41

Calculate the square root of the right side: 6.403124237

Break this problem into two subproblems by setting 
(x + 1) equal to 6.403124237 and -6.403124237.

Subproblem 1

x + 1 = 6.403124237 Simplifying x + 1 = 6.403124237 Reorder the terms: 1 + x = 6.403124237 Solving 1 + x = 6.403124237 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 = 6.403124237 + -1 Combine like terms: 1 + -1 = 0 0 + x = 6.403124237 + -1 x = 6.403124237 + -1 Combine like terms: 6.403124237 + -1 = 5.403124237 x = 5.403124237 Simplifying x = 5.403124237

Subproblem 2

x + 1 = -6.403124237 Simplifying x + 1 = -6.403124237 Reorder the terms: 1 + x = -6.403124237 Solving 1 + x = -6.403124237 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 = -6.403124237 + -1 Combine like terms: 1 + -1 = 0 0 + x = -6.403124237 + -1 x = -6.403124237 + -1 Combine like terms: -6.403124237 + -1 = -7.403124237 x = -7.403124237 Simplifying x = -7.403124237

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.403124237, -7.403124237}

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