n^2-9=2n+9

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Solution for n^2-9=2n+9 equation:


Simplifying
n2 + -9 = 2n + 9

Reorder the terms:
-9 + n2 = 2n + 9

Reorder the terms:
-9 + n2 = 9 + 2n

Solving
-9 + n2 = 9 + 2n

Solving for variable 'n'.

Reorder the terms:
-9 + -9 + -2n + n2 = 9 + 2n + -9 + -2n

Combine like terms: -9 + -9 = -18
-18 + -2n + n2 = 9 + 2n + -9 + -2n

Reorder the terms:
-18 + -2n + n2 = 9 + -9 + 2n + -2n

Combine like terms: 9 + -9 = 0
-18 + -2n + n2 = 0 + 2n + -2n
-18 + -2n + n2 = 2n + -2n

Combine like terms: 2n + -2n = 0
-18 + -2n + n2 = 0

Begin completing the square.

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + -2n + 18 + n2 = 0 + 18

Reorder the terms:
-18 + 18 + -2n + n2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + -2n + n2 = 0 + 18
-2n + n2 = 0 + 18

Combine like terms: 0 + 18 = 18
-2n + n2 = 18

The n term is -2n.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2n + 1 + n2 = 18 + 1

Reorder the terms:
1 + -2n + n2 = 18 + 1

Combine like terms: 18 + 1 = 19
1 + -2n + n2 = 19

Factor a perfect square on the left side:
(n + -1)(n + -1) = 19

Calculate the square root of the right side: 4.358898944

Break this problem into two subproblems by setting 
(n + -1) equal to 4.358898944 and -4.358898944.

Subproblem 1

n + -1 = 4.358898944 Simplifying n + -1 = 4.358898944 Reorder the terms: -1 + n = 4.358898944 Solving -1 + n = 4.358898944 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + n = 4.358898944 + 1 Combine like terms: -1 + 1 = 0 0 + n = 4.358898944 + 1 n = 4.358898944 + 1 Combine like terms: 4.358898944 + 1 = 5.358898944 n = 5.358898944 Simplifying n = 5.358898944

Subproblem 2

n + -1 = -4.358898944 Simplifying n + -1 = -4.358898944 Reorder the terms: -1 + n = -4.358898944 Solving -1 + n = -4.358898944 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + n = -4.358898944 + 1 Combine like terms: -1 + 1 = 0 0 + n = -4.358898944 + 1 n = -4.358898944 + 1 Combine like terms: -4.358898944 + 1 = -3.358898944 n = -3.358898944 Simplifying n = -3.358898944

Solution

The solution to the problem is based on the solutions from the subproblems. n = {5.358898944, -3.358898944}

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