x^2+9x-160=0

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Solution for x^2+9x-160=0 equation:


Simplifying
x2 + 9x + -160 = 0

Reorder the terms:
-160 + 9x + x2 = 0

Solving
-160 + 9x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '160' to each side of the equation.
-160 + 9x + 160 + x2 = 0 + 160

Reorder the terms:
-160 + 160 + 9x + x2 = 0 + 160

Combine like terms: -160 + 160 = 0
0 + 9x + x2 = 0 + 160
9x + x2 = 0 + 160

Combine like terms: 0 + 160 = 160
9x + x2 = 160

The x term is 9x.  Take half its coefficient (4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
9x + 20.25 + x2 = 160 + 20.25

Reorder the terms:
20.25 + 9x + x2 = 160 + 20.25

Combine like terms: 160 + 20.25 = 180.25
20.25 + 9x + x2 = 180.25

Factor a perfect square on the left side:
(x + 4.5)(x + 4.5) = 180.25

Calculate the square root of the right side: 13.425721582

Break this problem into two subproblems by setting 
(x + 4.5) equal to 13.425721582 and -13.425721582.

Subproblem 1

x + 4.5 = 13.425721582 Simplifying x + 4.5 = 13.425721582 Reorder the terms: 4.5 + x = 13.425721582 Solving 4.5 + x = 13.425721582 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = 13.425721582 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 13.425721582 + -4.5 x = 13.425721582 + -4.5 Combine like terms: 13.425721582 + -4.5 = 8.925721582 x = 8.925721582 Simplifying x = 8.925721582

Subproblem 2

x + 4.5 = -13.425721582 Simplifying x + 4.5 = -13.425721582 Reorder the terms: 4.5 + x = -13.425721582 Solving 4.5 + x = -13.425721582 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = -13.425721582 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -13.425721582 + -4.5 x = -13.425721582 + -4.5 Combine like terms: -13.425721582 + -4.5 = -17.925721582 x = -17.925721582 Simplifying x = -17.925721582

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.925721582, -17.925721582}

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