x^2+3x+11x+20=180

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Solution for x^2+3x+11x+20=180 equation:


Simplifying
x2 + 3x + 11x + 20 = 180

Reorder the terms:
20 + 3x + 11x + x2 = 180

Combine like terms: 3x + 11x = 14x
20 + 14x + x2 = 180

Solving
20 + 14x + x2 = 180

Solving for variable 'x'.

Reorder the terms:
20 + -180 + 14x + x2 = 180 + -180

Combine like terms: 20 + -180 = -160
-160 + 14x + x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-160 + 14x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '160' to each side of the equation.
-160 + 14x + 160 + x2 = 0 + 160

Reorder the terms:
-160 + 160 + 14x + x2 = 0 + 160

Combine like terms: -160 + 160 = 0
0 + 14x + x2 = 0 + 160
14x + x2 = 0 + 160

Combine like terms: 0 + 160 = 160
14x + x2 = 160

The x term is 14x.  Take half its coefficient (7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
14x + 49 + x2 = 160 + 49

Reorder the terms:
49 + 14x + x2 = 160 + 49

Combine like terms: 160 + 49 = 209
49 + 14x + x2 = 209

Factor a perfect square on the left side:
(x + 7)(x + 7) = 209

Calculate the square root of the right side: 14.456832295

Break this problem into two subproblems by setting 
(x + 7) equal to 14.456832295 and -14.456832295.

Subproblem 1

x + 7 = 14.456832295 Simplifying x + 7 = 14.456832295 Reorder the terms: 7 + x = 14.456832295 Solving 7 + x = 14.456832295 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = 14.456832295 + -7 Combine like terms: 7 + -7 = 0 0 + x = 14.456832295 + -7 x = 14.456832295 + -7 Combine like terms: 14.456832295 + -7 = 7.456832295 x = 7.456832295 Simplifying x = 7.456832295

Subproblem 2

x + 7 = -14.456832295 Simplifying x + 7 = -14.456832295 Reorder the terms: 7 + x = -14.456832295 Solving 7 + x = -14.456832295 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = -14.456832295 + -7 Combine like terms: 7 + -7 = 0 0 + x = -14.456832295 + -7 x = -14.456832295 + -7 Combine like terms: -14.456832295 + -7 = -21.456832295 x = -21.456832295 Simplifying x = -21.456832295

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.456832295, -21.456832295}

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