36=x^2+2x-8

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Solution for 36=x^2+2x-8 equation:


Simplifying
36 = x2 + 2x + -8

Reorder the terms:
36 = -8 + 2x + x2

Solving
36 = -8 + 2x + x2

Solving for variable 'x'.

Combine like terms: 36 + 8 = 44
44 + -2x + -1x2 = -8 + 2x + x2 + 8 + -2x + -1x2

Reorder the terms:
44 + -2x + -1x2 = -8 + 8 + 2x + -2x + x2 + -1x2

Combine like terms: -8 + 8 = 0
44 + -2x + -1x2 = 0 + 2x + -2x + x2 + -1x2
44 + -2x + -1x2 = 2x + -2x + x2 + -1x2

Combine like terms: 2x + -2x = 0
44 + -2x + -1x2 = 0 + x2 + -1x2
44 + -2x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
44 + -2x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-44 + 2x + x2 = 0

Move the constant term to the right:

Add '44' to each side of the equation.
-44 + 2x + 44 + x2 = 0 + 44

Reorder the terms:
-44 + 44 + 2x + x2 = 0 + 44

Combine like terms: -44 + 44 = 0
0 + 2x + x2 = 0 + 44
2x + x2 = 0 + 44

Combine like terms: 0 + 44 = 44
2x + x2 = 44

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 = 44 + 1

Reorder the terms:
1 + 2x + x2 = 44 + 1

Combine like terms: 44 + 1 = 45
1 + 2x + x2 = 45

Factor a perfect square on the left side:
(x + 1)(x + 1) = 45

Calculate the square root of the right side: 6.708203933

Break this problem into two subproblems by setting 
(x + 1) equal to 6.708203933 and -6.708203933.

Subproblem 1

x + 1 = 6.708203933 Simplifying x + 1 = 6.708203933 Reorder the terms: 1 + x = 6.708203933 Solving 1 + x = 6.708203933 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 = 6.708203933 + -1 Combine like terms: 1 + -1 = 0 0 + x = 6.708203933 + -1 x = 6.708203933 + -1 Combine like terms: 6.708203933 + -1 = 5.708203933 x = 5.708203933 Simplifying x = 5.708203933

Subproblem 2

x + 1 = -6.708203933 Simplifying x + 1 = -6.708203933 Reorder the terms: 1 + x = -6.708203933 Solving 1 + x = -6.708203933 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 = -6.708203933 + -1 Combine like terms: 1 + -1 = 0 0 + x = -6.708203933 + -1 x = -6.708203933 + -1 Combine like terms: -6.708203933 + -1 = -7.708203933 x = -7.708203933 Simplifying x = -7.708203933

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.708203933, -7.708203933}

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