n^2-135n+720=0

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Solution for n^2-135n+720=0 equation:


Simplifying
n2 + -135n + 720 = 0

Reorder the terms:
720 + -135n + n2 = 0

Solving
720 + -135n + n2 = 0

Solving for variable 'n'.

Begin completing the square.

Move the constant term to the right:

Add '-720' to each side of the equation.
720 + -135n + -720 + n2 = 0 + -720

Reorder the terms:
720 + -720 + -135n + n2 = 0 + -720

Combine like terms: 720 + -720 = 0
0 + -135n + n2 = 0 + -720
-135n + n2 = 0 + -720

Combine like terms: 0 + -720 = -720
-135n + n2 = -720

The n term is -135n.  Take half its coefficient (-67.5).
Square it (4556.25) and add it to both sides.

Add '4556.25' to each side of the equation.
-135n + 4556.25 + n2 = -720 + 4556.25

Reorder the terms:
4556.25 + -135n + n2 = -720 + 4556.25

Combine like terms: -720 + 4556.25 = 3836.25
4556.25 + -135n + n2 = 3836.25

Factor a perfect square on the left side:
(n + -67.5)(n + -67.5) = 3836.25

Calculate the square root of the right side: 61.937468466

Break this problem into two subproblems by setting 
(n + -67.5) equal to 61.937468466 and -61.937468466.

Subproblem 1

n + -67.5 = 61.937468466 Simplifying n + -67.5 = 61.937468466 Reorder the terms: -67.5 + n = 61.937468466 Solving -67.5 + n = 61.937468466 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '67.5' to each side of the equation. -67.5 + 67.5 + n = 61.937468466 + 67.5 Combine like terms: -67.5 + 67.5 = 0.0 0.0 + n = 61.937468466 + 67.5 n = 61.937468466 + 67.5 Combine like terms: 61.937468466 + 67.5 = 129.437468466 n = 129.437468466 Simplifying n = 129.437468466

Subproblem 2

n + -67.5 = -61.937468466 Simplifying n + -67.5 = -61.937468466 Reorder the terms: -67.5 + n = -61.937468466 Solving -67.5 + n = -61.937468466 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '67.5' to each side of the equation. -67.5 + 67.5 + n = -61.937468466 + 67.5 Combine like terms: -67.5 + 67.5 = 0.0 0.0 + n = -61.937468466 + 67.5 n = -61.937468466 + 67.5 Combine like terms: -61.937468466 + 67.5 = 5.562531534 n = 5.562531534 Simplifying n = 5.562531534

Solution

The solution to the problem is based on the solutions from the subproblems. n = {129.437468466, 5.562531534}

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