x+3x(x+40)=180

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Solution for x+3x(x+40)=180 equation:


Simplifying
x + 3x(x + 40) = 180

Reorder the terms:
x + 3x(40 + x) = 180
x + (40 * 3x + x * 3x) = 180
x + (120x + 3x2) = 180

Combine like terms: x + 120x = 121x
121x + 3x2 = 180

Solving
121x + 3x2 = 180

Solving for variable 'x'.

Reorder the terms:
-180 + 121x + 3x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-180 + 121x + 3x2 = 0

Begin completing the square.  Divide all terms by
3 the coefficient of the squared term: 

Divide each side by '3'.
-60 + 40.33333333x + x2 = 0

Move the constant term to the right:

Add '60' to each side of the equation.
-60 + 40.33333333x + 60 + x2 = 0 + 60

Reorder the terms:
-60 + 60 + 40.33333333x + x2 = 0 + 60

Combine like terms: -60 + 60 = 0
0 + 40.33333333x + x2 = 0 + 60
40.33333333x + x2 = 0 + 60

Combine like terms: 0 + 60 = 60
40.33333333x + x2 = 60

The x term is 40.33333333x.  Take half its coefficient (20.16666667).
Square it (406.6944446) and add it to both sides.

Add '406.6944446' to each side of the equation.
40.33333333x + 406.6944446 + x2 = 60 + 406.6944446

Reorder the terms:
406.6944446 + 40.33333333x + x2 = 60 + 406.6944446

Combine like terms: 60 + 406.6944446 = 466.6944446
406.6944446 + 40.33333333x + x2 = 466.6944446

Factor a perfect square on the left side:
(x + 20.16666667)(x + 20.16666667) = 466.6944446

Calculate the square root of the right side: 21.603111919

Break this problem into two subproblems by setting 
(x + 20.16666667) equal to 21.603111919 and -21.603111919.

Subproblem 1

x + 20.16666667 = 21.603111919 Simplifying x + 20.16666667 = 21.603111919 Reorder the terms: 20.16666667 + x = 21.603111919 Solving 20.16666667 + x = 21.603111919 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20.16666667' to each side of the equation. 20.16666667 + -20.16666667 + x = 21.603111919 + -20.16666667 Combine like terms: 20.16666667 + -20.16666667 = 0.00000000 0.00000000 + x = 21.603111919 + -20.16666667 x = 21.603111919 + -20.16666667 Combine like terms: 21.603111919 + -20.16666667 = 1.436445249 x = 1.436445249 Simplifying x = 1.436445249

Subproblem 2

x + 20.16666667 = -21.603111919 Simplifying x + 20.16666667 = -21.603111919 Reorder the terms: 20.16666667 + x = -21.603111919 Solving 20.16666667 + x = -21.603111919 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20.16666667' to each side of the equation. 20.16666667 + -20.16666667 + x = -21.603111919 + -20.16666667 Combine like terms: 20.16666667 + -20.16666667 = 0.00000000 0.00000000 + x = -21.603111919 + -20.16666667 x = -21.603111919 + -20.16666667 Combine like terms: -21.603111919 + -20.16666667 = -41.769778589 x = -41.769778589 Simplifying x = -41.769778589

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.436445249, -41.769778589}

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