x^2+9x=88

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Solution for x^2+9x=88 equation:


Simplifying
x2 + 9x = 88

Reorder the terms:
9x + x2 = 88

Solving
9x + x2 = 88

Solving for variable 'x'.

Reorder the terms:
-88 + 9x + x2 = 88 + -88

Combine like terms: 88 + -88 = 0
-88 + 9x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '88' to each side of the equation.
-88 + 9x + 88 + x2 = 0 + 88

Reorder the terms:
-88 + 88 + 9x + x2 = 0 + 88

Combine like terms: -88 + 88 = 0
0 + 9x + x2 = 0 + 88
9x + x2 = 0 + 88

Combine like terms: 0 + 88 = 88
9x + x2 = 88

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 = 88 + 20.25

Reorder the terms:
20.25 + 9x + x2 = 88 + 20.25

Combine like terms: 88 + 20.25 = 108.25
20.25 + 9x + x2 = 108.25

Factor a perfect square on the left side:
(x + 4.5)(x + 4.5) = 108.25

Calculate the square root of the right side: 10.404326023

Break this problem into two subproblems by setting 
(x + 4.5) equal to 10.404326023 and -10.404326023.

Subproblem 1

x + 4.5 = 10.404326023 Simplifying x + 4.5 = 10.404326023 Reorder the terms: 4.5 + x = 10.404326023 Solving 4.5 + x = 10.404326023 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 = 10.404326023 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 10.404326023 + -4.5 x = 10.404326023 + -4.5 Combine like terms: 10.404326023 + -4.5 = 5.904326023 x = 5.904326023 Simplifying x = 5.904326023

Subproblem 2

x + 4.5 = -10.404326023 Simplifying x + 4.5 = -10.404326023 Reorder the terms: 4.5 + x = -10.404326023 Solving 4.5 + x = -10.404326023 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 = -10.404326023 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -10.404326023 + -4.5 x = -10.404326023 + -4.5 Combine like terms: -10.404326023 + -4.5 = -14.904326023 x = -14.904326023 Simplifying x = -14.904326023

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.904326023, -14.904326023}

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