x^2+9x=170

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Solution for x^2+9x=170 equation:


Simplifying
x2 + 9x = 170

Reorder the terms:
9x + x2 = 170

Solving
9x + x2 = 170

Solving for variable 'x'.

Reorder the terms:
-170 + 9x + x2 = 170 + -170

Combine like terms: 170 + -170 = 0
-170 + 9x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '170' to each side of the equation.
-170 + 9x + 170 + x2 = 0 + 170

Reorder the terms:
-170 + 170 + 9x + x2 = 0 + 170

Combine like terms: -170 + 170 = 0
0 + 9x + x2 = 0 + 170
9x + x2 = 0 + 170

Combine like terms: 0 + 170 = 170
9x + x2 = 170

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 = 170 + 20.25

Reorder the terms:
20.25 + 9x + x2 = 170 + 20.25

Combine like terms: 170 + 20.25 = 190.25
20.25 + 9x + x2 = 190.25

Factor a perfect square on the left side:
(x + 4.5)(x + 4.5) = 190.25

Calculate the square root of the right side: 13.793114224

Break this problem into two subproblems by setting 
(x + 4.5) equal to 13.793114224 and -13.793114224.

Subproblem 1

x + 4.5 = 13.793114224 Simplifying x + 4.5 = 13.793114224 Reorder the terms: 4.5 + x = 13.793114224 Solving 4.5 + x = 13.793114224 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 = 13.793114224 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 13.793114224 + -4.5 x = 13.793114224 + -4.5 Combine like terms: 13.793114224 + -4.5 = 9.293114224 x = 9.293114224 Simplifying x = 9.293114224

Subproblem 2

x + 4.5 = -13.793114224 Simplifying x + 4.5 = -13.793114224 Reorder the terms: 4.5 + x = -13.793114224 Solving 4.5 + x = -13.793114224 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 = -13.793114224 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -13.793114224 + -4.5 x = -13.793114224 + -4.5 Combine like terms: -13.793114224 + -4.5 = -18.293114224 x = -18.293114224 Simplifying x = -18.293114224

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.293114224, -18.293114224}

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