x(x-4)+(x+9)=180

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Solution for x(x-4)+(x+9)=180 equation:


Simplifying
x(x + -4) + (x + 9) = 180

Reorder the terms:
x(-4 + x) + (x + 9) = 180
(-4 * x + x * x) + (x + 9) = 180
(-4x + x2) + (x + 9) = 180

Reorder the terms:
-4x + x2 + (9 + x) = 180

Remove parenthesis around (9 + x)
-4x + x2 + 9 + x = 180

Reorder the terms:
9 + -4x + x + x2 = 180

Combine like terms: -4x + x = -3x
9 + -3x + x2 = 180

Solving
9 + -3x + x2 = 180

Solving for variable 'x'.

Reorder the terms:
9 + -180 + -3x + x2 = 180 + -180

Combine like terms: 9 + -180 = -171
-171 + -3x + x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-171 + -3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '171' to each side of the equation.
-171 + -3x + 171 + x2 = 0 + 171

Reorder the terms:
-171 + 171 + -3x + x2 = 0 + 171

Combine like terms: -171 + 171 = 0
0 + -3x + x2 = 0 + 171
-3x + x2 = 0 + 171

Combine like terms: 0 + 171 = 171
-3x + x2 = 171

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 171 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 171 + 2.25

Combine like terms: 171 + 2.25 = 173.25
2.25 + -3x + x2 = 173.25

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 173.25

Calculate the square root of the right side: 13.162446581

Break this problem into two subproblems by setting 
(x + -1.5) equal to 13.162446581 and -13.162446581.

Subproblem 1

x + -1.5 = 13.162446581 Simplifying x + -1.5 = 13.162446581 Reorder the terms: -1.5 + x = 13.162446581 Solving -1.5 + x = 13.162446581 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 13.162446581 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 13.162446581 + 1.5 x = 13.162446581 + 1.5 Combine like terms: 13.162446581 + 1.5 = 14.662446581 x = 14.662446581 Simplifying x = 14.662446581

Subproblem 2

x + -1.5 = -13.162446581 Simplifying x + -1.5 = -13.162446581 Reorder the terms: -1.5 + x = -13.162446581 Solving -1.5 + x = -13.162446581 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -13.162446581 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -13.162446581 + 1.5 x = -13.162446581 + 1.5 Combine like terms: -13.162446581 + 1.5 = -11.662446581 x = -11.662446581 Simplifying x = -11.662446581

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.662446581, -11.662446581}

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