x+x(x+39)=180

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Solution for x+x(x+39)=180 equation:


Simplifying
x + x(x + 39) = 180

Reorder the terms:
x + x(39 + x) = 180
x + (39 * x + x * x) = 180
x + (39x + x2) = 180

Combine like terms: x + 39x = 40x
40x + x2 = 180

Solving
40x + x2 = 180

Solving for variable 'x'.

Reorder the terms:
-180 + 40x + x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-180 + 40x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '180' to each side of the equation.
-180 + 40x + 180 + x2 = 0 + 180

Reorder the terms:
-180 + 180 + 40x + x2 = 0 + 180

Combine like terms: -180 + 180 = 0
0 + 40x + x2 = 0 + 180
40x + x2 = 0 + 180

Combine like terms: 0 + 180 = 180
40x + x2 = 180

The x term is 40x.  Take half its coefficient (20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
40x + 400 + x2 = 180 + 400

Reorder the terms:
400 + 40x + x2 = 180 + 400

Combine like terms: 180 + 400 = 580
400 + 40x + x2 = 580

Factor a perfect square on the left side:
(x + 20)(x + 20) = 580

Calculate the square root of the right side: 24.083189158

Break this problem into two subproblems by setting 
(x + 20) equal to 24.083189158 and -24.083189158.

Subproblem 1

x + 20 = 24.083189158 Simplifying x + 20 = 24.083189158 Reorder the terms: 20 + x = 24.083189158 Solving 20 + x = 24.083189158 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + x = 24.083189158 + -20 Combine like terms: 20 + -20 = 0 0 + x = 24.083189158 + -20 x = 24.083189158 + -20 Combine like terms: 24.083189158 + -20 = 4.083189158 x = 4.083189158 Simplifying x = 4.083189158

Subproblem 2

x + 20 = -24.083189158 Simplifying x + 20 = -24.083189158 Reorder the terms: 20 + x = -24.083189158 Solving 20 + x = -24.083189158 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + x = -24.083189158 + -20 Combine like terms: 20 + -20 = 0 0 + x = -24.083189158 + -20 x = -24.083189158 + -20 Combine like terms: -24.083189158 + -20 = -44.083189158 x = -44.083189158 Simplifying x = -44.083189158

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.083189158, -44.083189158}

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