x^2+3x+20=180

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


Simplifying
x2 + 3x + 20 = 180

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

Solving
20 + 3x + x2 = 180

Solving for variable 'x'.

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

Combine like terms: 20 + -180 = -160
-160 + 3x + x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-160 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '160' to each side of the equation.
-160 + 3x + 160 + x2 = 0 + 160

Reorder the terms:
-160 + 160 + 3x + x2 = 0 + 160

Combine like terms: -160 + 160 = 0
0 + 3x + x2 = 0 + 160
3x + x2 = 0 + 160

Combine like terms: 0 + 160 = 160
3x + x2 = 160

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 = 160 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 160 + 2.25

Combine like terms: 160 + 2.25 = 162.25
2.25 + 3x + x2 = 162.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 162.25

Calculate the square root of the right side: 12.737739203

Break this problem into two subproblems by setting 
(x + 1.5) equal to 12.737739203 and -12.737739203.

Subproblem 1

x + 1.5 = 12.737739203 Simplifying x + 1.5 = 12.737739203 Reorder the terms: 1.5 + x = 12.737739203 Solving 1.5 + x = 12.737739203 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 = 12.737739203 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 12.737739203 + -1.5 x = 12.737739203 + -1.5 Combine like terms: 12.737739203 + -1.5 = 11.237739203 x = 11.237739203 Simplifying x = 11.237739203

Subproblem 2

x + 1.5 = -12.737739203 Simplifying x + 1.5 = -12.737739203 Reorder the terms: 1.5 + x = -12.737739203 Solving 1.5 + x = -12.737739203 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 = -12.737739203 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -12.737739203 + -1.5 x = -12.737739203 + -1.5 Combine like terms: -12.737739203 + -1.5 = -14.237739203 x = -14.237739203 Simplifying x = -14.237739203

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.237739203, -14.237739203}

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