(x+6)x+9=72.25

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Solution for (x+6)x+9=72.25 equation:


Simplifying
(x + 6) * x + 9 = 72.25

Reorder the terms:
(6 + x) * x + 9 = 72.25

Reorder the terms for easier multiplication:
x(6 + x) + 9 = 72.25
(6 * x + x * x) + 9 = 72.25
(6x + x2) + 9 = 72.25

Reorder the terms:
9 + 6x + x2 = 72.25

Solving
9 + 6x + x2 = 72.25

Solving for variable 'x'.

Reorder the terms:
9 + -72.25 + 6x + x2 = 72.25 + -72.25

Combine like terms: 9 + -72.25 = -63.25
-63.25 + 6x + x2 = 72.25 + -72.25

Combine like terms: 72.25 + -72.25 = 0.00
-63.25 + 6x + x2 = 0.00

Begin completing the square.

Move the constant term to the right:

Add '63.25' to each side of the equation.
-63.25 + 6x + 63.25 + x2 = 0.00 + 63.25

Reorder the terms:
-63.25 + 63.25 + 6x + x2 = 0.00 + 63.25

Combine like terms: -63.25 + 63.25 = 0.00
0.00 + 6x + x2 = 0.00 + 63.25
6x + x2 = 0.00 + 63.25

Combine like terms: 0.00 + 63.25 = 63.25
6x + x2 = 63.25

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 = 63.25 + 9

Reorder the terms:
9 + 6x + x2 = 63.25 + 9

Combine like terms: 63.25 + 9 = 72.25
9 + 6x + x2 = 72.25

Factor a perfect square on the left side:
(x + 3)(x + 3) = 72.25

Calculate the square root of the right side: 8.5

Break this problem into two subproblems by setting 
(x + 3) equal to 8.5 and -8.5.

Subproblem 1

x + 3 = 8.5 Simplifying x + 3 = 8.5 Reorder the terms: 3 + x = 8.5 Solving 3 + x = 8.5 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 = 8.5 + -3 Combine like terms: 3 + -3 = 0 0 + x = 8.5 + -3 x = 8.5 + -3 Combine like terms: 8.5 + -3 = 5.5 x = 5.5 Simplifying x = 5.5

Subproblem 2

x + 3 = -8.5 Simplifying x + 3 = -8.5 Reorder the terms: 3 + x = -8.5 Solving 3 + x = -8.5 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 = -8.5 + -3 Combine like terms: 3 + -3 = 0 0 + x = -8.5 + -3 x = -8.5 + -3 Combine like terms: -8.5 + -3 = -11.5 x = -11.5 Simplifying x = -11.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.5, -11.5}

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