x*x+18*x=531

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Solution for x*x+18*x=531 equation:


Simplifying
x * x + 18x = 531

Multiply x * x
x2 + 18x = 531

Reorder the terms:
18x + x2 = 531

Solving
18x + x2 = 531

Solving for variable 'x'.

Reorder the terms:
-531 + 18x + x2 = 531 + -531

Combine like terms: 531 + -531 = 0
-531 + 18x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '531' to each side of the equation.
-531 + 18x + 531 + x2 = 0 + 531

Reorder the terms:
-531 + 531 + 18x + x2 = 0 + 531

Combine like terms: -531 + 531 = 0
0 + 18x + x2 = 0 + 531
18x + x2 = 0 + 531

Combine like terms: 0 + 531 = 531
18x + x2 = 531

The x term is 18x.  Take half its coefficient (9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
18x + 81 + x2 = 531 + 81

Reorder the terms:
81 + 18x + x2 = 531 + 81

Combine like terms: 531 + 81 = 612
81 + 18x + x2 = 612

Factor a perfect square on the left side:
(x + 9)(x + 9) = 612

Calculate the square root of the right side: 24.738633754

Break this problem into two subproblems by setting 
(x + 9) equal to 24.738633754 and -24.738633754.

Subproblem 1

x + 9 = 24.738633754 Simplifying x + 9 = 24.738633754 Reorder the terms: 9 + x = 24.738633754 Solving 9 + x = 24.738633754 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = 24.738633754 + -9 Combine like terms: 9 + -9 = 0 0 + x = 24.738633754 + -9 x = 24.738633754 + -9 Combine like terms: 24.738633754 + -9 = 15.738633754 x = 15.738633754 Simplifying x = 15.738633754

Subproblem 2

x + 9 = -24.738633754 Simplifying x + 9 = -24.738633754 Reorder the terms: 9 + x = -24.738633754 Solving 9 + x = -24.738633754 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = -24.738633754 + -9 Combine like terms: 9 + -9 = 0 0 + x = -24.738633754 + -9 x = -24.738633754 + -9 Combine like terms: -24.738633754 + -9 = -33.738633754 x = -33.738633754 Simplifying x = -33.738633754

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.738633754, -33.738633754}

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