x^2+6x=206.25

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Solution for x^2+6x=206.25 equation:


Simplifying
x2 + 6x = 206.25

Reorder the terms:
6x + x2 = 206.25

Solving
6x + x2 = 206.25

Solving for variable 'x'.

Reorder the terms:
-206.25 + 6x + x2 = 206.25 + -206.25

Combine like terms: 206.25 + -206.25 = 0.00
-206.25 + 6x + x2 = 0.00

Begin completing the square.

Move the constant term to the right:

Add '206.25' to each side of the equation.
-206.25 + 6x + 206.25 + x2 = 0.00 + 206.25

Reorder the terms:
-206.25 + 206.25 + 6x + x2 = 0.00 + 206.25

Combine like terms: -206.25 + 206.25 = 0.00
0.00 + 6x + x2 = 0.00 + 206.25
6x + x2 = 0.00 + 206.25

Combine like terms: 0.00 + 206.25 = 206.25
6x + x2 = 206.25

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 206.25 + 9

Reorder the terms:
9 + 6x + x2 = 206.25 + 9

Combine like terms: 206.25 + 9 = 215.25
9 + 6x + x2 = 215.25

Factor a perfect square on the left side:
(x + 3)(x + 3) = 215.25

Calculate the square root of the right side: 14.671400751

Break this problem into two subproblems by setting 
(x + 3) equal to 14.671400751 and -14.671400751.

Subproblem 1

x + 3 = 14.671400751 Simplifying x + 3 = 14.671400751 Reorder the terms: 3 + x = 14.671400751 Solving 3 + x = 14.671400751 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 14.671400751 + -3 Combine like terms: 3 + -3 = 0 0 + x = 14.671400751 + -3 x = 14.671400751 + -3 Combine like terms: 14.671400751 + -3 = 11.671400751 x = 11.671400751 Simplifying x = 11.671400751

Subproblem 2

x + 3 = -14.671400751 Simplifying x + 3 = -14.671400751 Reorder the terms: 3 + x = -14.671400751 Solving 3 + x = -14.671400751 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -14.671400751 + -3 Combine like terms: 3 + -3 = 0 0 + x = -14.671400751 + -3 x = -14.671400751 + -3 Combine like terms: -14.671400751 + -3 = -17.671400751 x = -17.671400751 Simplifying x = -17.671400751

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.671400751, -17.671400751}

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