(90-x)+(90-x)(90-x)=180

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Solution for (90-x)+(90-x)(90-x)=180 equation:


Simplifying
(90 + -1x) + (90 + -1x)(90 + -1x) = 180

Remove parenthesis around (90 + -1x)
90 + -1x + (90 + -1x)(90 + -1x) = 180

Multiply (90 + -1x) * (90 + -1x)
90 + -1x + (90(90 + -1x) + -1x * (90 + -1x)) = 180
90 + -1x + ((90 * 90 + -1x * 90) + -1x * (90 + -1x)) = 180
90 + -1x + ((8100 + -90x) + -1x * (90 + -1x)) = 180
90 + -1x + (8100 + -90x + (90 * -1x + -1x * -1x)) = 180
90 + -1x + (8100 + -90x + (-90x + 1x2)) = 180

Combine like terms: -90x + -90x = -180x
90 + -1x + (8100 + -180x + 1x2) = 180

Reorder the terms:
90 + 8100 + -1x + -180x + 1x2 = 180

Combine like terms: 90 + 8100 = 8190
8190 + -1x + -180x + 1x2 = 180

Combine like terms: -1x + -180x = -181x
8190 + -181x + 1x2 = 180

Solving
8190 + -181x + 1x2 = 180

Solving for variable 'x'.

Reorder the terms:
8190 + -180 + -181x + 1x2 = 180 + -180

Combine like terms: 8190 + -180 = 8010
8010 + -181x + 1x2 = 180 + -180

Combine like terms: 180 + -180 = 0
8010 + -181x + 1x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-8010' to each side of the equation.
8010 + -181x + -8010 + x2 = 0 + -8010

Reorder the terms:
8010 + -8010 + -181x + x2 = 0 + -8010

Combine like terms: 8010 + -8010 = 0
0 + -181x + x2 = 0 + -8010
-181x + x2 = 0 + -8010

Combine like terms: 0 + -8010 = -8010
-181x + x2 = -8010

The x term is -181x.  Take half its coefficient (-90.5).
Square it (8190.25) and add it to both sides.

Add '8190.25' to each side of the equation.
-181x + 8190.25 + x2 = -8010 + 8190.25

Reorder the terms:
8190.25 + -181x + x2 = -8010 + 8190.25

Combine like terms: -8010 + 8190.25 = 180.25
8190.25 + -181x + x2 = 180.25

Factor a perfect square on the left side:
(x + -90.5)(x + -90.5) = 180.25

Calculate the square root of the right side: 13.425721582

Break this problem into two subproblems by setting 
(x + -90.5) equal to 13.425721582 and -13.425721582.

Subproblem 1

x + -90.5 = 13.425721582 Simplifying x + -90.5 = 13.425721582 Reorder the terms: -90.5 + x = 13.425721582 Solving -90.5 + x = 13.425721582 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '90.5' to each side of the equation. -90.5 + 90.5 + x = 13.425721582 + 90.5 Combine like terms: -90.5 + 90.5 = 0.0 0.0 + x = 13.425721582 + 90.5 x = 13.425721582 + 90.5 Combine like terms: 13.425721582 + 90.5 = 103.925721582 x = 103.925721582 Simplifying x = 103.925721582

Subproblem 2

x + -90.5 = -13.425721582 Simplifying x + -90.5 = -13.425721582 Reorder the terms: -90.5 + x = -13.425721582 Solving -90.5 + x = -13.425721582 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '90.5' to each side of the equation. -90.5 + 90.5 + x = -13.425721582 + 90.5 Combine like terms: -90.5 + 90.5 = 0.0 0.0 + x = -13.425721582 + 90.5 x = -13.425721582 + 90.5 Combine like terms: -13.425721582 + 90.5 = 77.074278418 x = 77.074278418 Simplifying x = 77.074278418

Solution

The solution to the problem is based on the solutions from the subproblems. x = {103.925721582, 77.074278418}

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