x+2x(2x+15)=180

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Solution for x+2x(2x+15)=180 equation:


Simplifying
x + 2x(2x + 15) = 180

Reorder the terms:
x + 2x(15 + 2x) = 180
x + (15 * 2x + 2x * 2x) = 180
x + (30x + 4x2) = 180

Combine like terms: x + 30x = 31x
31x + 4x2 = 180

Solving
31x + 4x2 = 180

Solving for variable 'x'.

Reorder the terms:
-180 + 31x + 4x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-180 + 31x + 4x2 = 0

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

Divide each side by '4'.
-45 + 7.75x + x2 = 0

Move the constant term to the right:

Add '45' to each side of the equation.
-45 + 7.75x + 45 + x2 = 0 + 45

Reorder the terms:
-45 + 45 + 7.75x + x2 = 0 + 45

Combine like terms: -45 + 45 = 0
0 + 7.75x + x2 = 0 + 45
7.75x + x2 = 0 + 45

Combine like terms: 0 + 45 = 45
7.75x + x2 = 45

The x term is 7.75x.  Take half its coefficient (3.875).
Square it (15.015625) and add it to both sides.

Add '15.015625' to each side of the equation.
7.75x + 15.015625 + x2 = 45 + 15.015625

Reorder the terms:
15.015625 + 7.75x + x2 = 45 + 15.015625

Combine like terms: 45 + 15.015625 = 60.015625
15.015625 + 7.75x + x2 = 60.015625

Factor a perfect square on the left side:
(x + 3.875)(x + 3.875) = 60.015625

Calculate the square root of the right side: 7.746975216

Break this problem into two subproblems by setting 
(x + 3.875) equal to 7.746975216 and -7.746975216.

Subproblem 1

x + 3.875 = 7.746975216 Simplifying x + 3.875 = 7.746975216 Reorder the terms: 3.875 + x = 7.746975216 Solving 3.875 + x = 7.746975216 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.875' to each side of the equation. 3.875 + -3.875 + x = 7.746975216 + -3.875 Combine like terms: 3.875 + -3.875 = 0.000 0.000 + x = 7.746975216 + -3.875 x = 7.746975216 + -3.875 Combine like terms: 7.746975216 + -3.875 = 3.871975216 x = 3.871975216 Simplifying x = 3.871975216

Subproblem 2

x + 3.875 = -7.746975216 Simplifying x + 3.875 = -7.746975216 Reorder the terms: 3.875 + x = -7.746975216 Solving 3.875 + x = -7.746975216 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.875' to each side of the equation. 3.875 + -3.875 + x = -7.746975216 + -3.875 Combine like terms: 3.875 + -3.875 = 0.000 0.000 + x = -7.746975216 + -3.875 x = -7.746975216 + -3.875 Combine like terms: -7.746975216 + -3.875 = -11.621975216 x = -11.621975216 Simplifying x = -11.621975216

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.871975216, -11.621975216}

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