72+x(x-2)=180

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Solution for 72+x(x-2)=180 equation:


Simplifying
72 + x(x + -2) = 180

Reorder the terms:
72 + x(-2 + x) = 180
72 + (-2 * x + x * x) = 180
72 + (-2x + x2) = 180

Solving
72 + -2x + x2 = 180

Solving for variable 'x'.

Reorder the terms:
72 + -180 + -2x + x2 = 180 + -180

Combine like terms: 72 + -180 = -108
-108 + -2x + x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-108 + -2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '108' to each side of the equation.
-108 + -2x + 108 + x2 = 0 + 108

Reorder the terms:
-108 + 108 + -2x + x2 = 0 + 108

Combine like terms: -108 + 108 = 0
0 + -2x + x2 = 0 + 108
-2x + x2 = 0 + 108

Combine like terms: 0 + 108 = 108
-2x + x2 = 108

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 = 108 + 1

Reorder the terms:
1 + -2x + x2 = 108 + 1

Combine like terms: 108 + 1 = 109
1 + -2x + x2 = 109

Factor a perfect square on the left side:
(x + -1)(x + -1) = 109

Calculate the square root of the right side: 10.440306509

Break this problem into two subproblems by setting 
(x + -1) equal to 10.440306509 and -10.440306509.

Subproblem 1

x + -1 = 10.440306509 Simplifying x + -1 = 10.440306509 Reorder the terms: -1 + x = 10.440306509 Solving -1 + x = 10.440306509 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 = 10.440306509 + 1 Combine like terms: -1 + 1 = 0 0 + x = 10.440306509 + 1 x = 10.440306509 + 1 Combine like terms: 10.440306509 + 1 = 11.440306509 x = 11.440306509 Simplifying x = 11.440306509

Subproblem 2

x + -1 = -10.440306509 Simplifying x + -1 = -10.440306509 Reorder the terms: -1 + x = -10.440306509 Solving -1 + x = -10.440306509 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 = -10.440306509 + 1 Combine like terms: -1 + 1 = 0 0 + x = -10.440306509 + 1 x = -10.440306509 + 1 Combine like terms: -10.440306509 + 1 = -9.440306509 x = -9.440306509 Simplifying x = -9.440306509

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.440306509, -9.440306509}

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