(x^2-8x)+(4x+20)=180

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Solution for (x^2-8x)+(4x+20)=180 equation:


Simplifying
(x2 + -8x) + (4x + 20) = 180

Reorder the terms:
(-8x + x2) + (4x + 20) = 180

Remove parenthesis around (-8x + x2)
-8x + x2 + (4x + 20) = 180

Reorder the terms:
-8x + x2 + (20 + 4x) = 180

Remove parenthesis around (20 + 4x)
-8x + x2 + 20 + 4x = 180

Reorder the terms:
20 + -8x + 4x + x2 = 180

Combine like terms: -8x + 4x = -4x
20 + -4x + x2 = 180

Solving
20 + -4x + x2 = 180

Solving for variable 'x'.

Reorder the terms:
20 + -180 + -4x + x2 = 180 + -180

Combine like terms: 20 + -180 = -160
-160 + -4x + x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-160 + -4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '160' to each side of the equation.
-160 + -4x + 160 + x2 = 0 + 160

Reorder the terms:
-160 + 160 + -4x + x2 = 0 + 160

Combine like terms: -160 + 160 = 0
0 + -4x + x2 = 0 + 160
-4x + x2 = 0 + 160

Combine like terms: 0 + 160 = 160
-4x + x2 = 160

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 160 + 4

Reorder the terms:
4 + -4x + x2 = 160 + 4

Combine like terms: 160 + 4 = 164
4 + -4x + x2 = 164

Factor a perfect square on the left side:
(x + -2)(x + -2) = 164

Calculate the square root of the right side: 12.806248475

Break this problem into two subproblems by setting 
(x + -2) equal to 12.806248475 and -12.806248475.

Subproblem 1

x + -2 = 12.806248475 Simplifying x + -2 = 12.806248475 Reorder the terms: -2 + x = 12.806248475 Solving -2 + x = 12.806248475 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 12.806248475 + 2 Combine like terms: -2 + 2 = 0 0 + x = 12.806248475 + 2 x = 12.806248475 + 2 Combine like terms: 12.806248475 + 2 = 14.806248475 x = 14.806248475 Simplifying x = 14.806248475

Subproblem 2

x + -2 = -12.806248475 Simplifying x + -2 = -12.806248475 Reorder the terms: -2 + x = -12.806248475 Solving -2 + x = -12.806248475 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -12.806248475 + 2 Combine like terms: -2 + 2 = 0 0 + x = -12.806248475 + 2 x = -12.806248475 + 2 Combine like terms: -12.806248475 + 2 = -10.806248475 x = -10.806248475 Simplifying x = -10.806248475

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.806248475, -10.806248475}

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