8=x^2+8x-36

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


Simplifying
8 = x2 + 8x + -36

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

Solving
8 = -36 + 8x + x2

Solving for variable 'x'.

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

Reorder the terms:
44 + -8x + -1x2 = -36 + 36 + 8x + -8x + x2 + -1x2

Combine like terms: -36 + 36 = 0
44 + -8x + -1x2 = 0 + 8x + -8x + x2 + -1x2
44 + -8x + -1x2 = 8x + -8x + x2 + -1x2

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

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

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

Divide each side by '-1'.
-44 + 8x + x2 = 0

Move the constant term to the right:

Add '44' to each side of the equation.
-44 + 8x + 44 + x2 = 0 + 44

Reorder the terms:
-44 + 44 + 8x + x2 = 0 + 44

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

Combine like terms: 0 + 44 = 44
8x + x2 = 44

The x term is 8x.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x + 16 + x2 = 44 + 16

Reorder the terms:
16 + 8x + x2 = 44 + 16

Combine like terms: 44 + 16 = 60
16 + 8x + x2 = 60

Factor a perfect square on the left side:
(x + 4)(x + 4) = 60

Calculate the square root of the right side: 7.745966692

Break this problem into two subproblems by setting 
(x + 4) equal to 7.745966692 and -7.745966692.

Subproblem 1

x + 4 = 7.745966692 Simplifying x + 4 = 7.745966692 Reorder the terms: 4 + x = 7.745966692 Solving 4 + x = 7.745966692 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 7.745966692 + -4 Combine like terms: 4 + -4 = 0 0 + x = 7.745966692 + -4 x = 7.745966692 + -4 Combine like terms: 7.745966692 + -4 = 3.745966692 x = 3.745966692 Simplifying x = 3.745966692

Subproblem 2

x + 4 = -7.745966692 Simplifying x + 4 = -7.745966692 Reorder the terms: 4 + x = -7.745966692 Solving 4 + x = -7.745966692 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = -7.745966692 + -4 Combine like terms: 4 + -4 = 0 0 + x = -7.745966692 + -4 x = -7.745966692 + -4 Combine like terms: -7.745966692 + -4 = -11.745966692 x = -11.745966692 Simplifying x = -11.745966692

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.745966692, -11.745966692}

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