n^2-9n-40=-8-5

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Solution for n^2-9n-40=-8-5 equation:


Simplifying
n2 + -9n + -40 = -8 + -5

Reorder the terms:
-40 + -9n + n2 = -8 + -5

Combine like terms: -8 + -5 = -13
-40 + -9n + n2 = -13

Solving
-40 + -9n + n2 = -13

Solving for variable 'n'.

Reorder the terms:
-40 + 13 + -9n + n2 = -13 + 13

Combine like terms: -40 + 13 = -27
-27 + -9n + n2 = -13 + 13

Combine like terms: -13 + 13 = 0
-27 + -9n + n2 = 0

Begin completing the square.

Move the constant term to the right:

Add '27' to each side of the equation.
-27 + -9n + 27 + n2 = 0 + 27

Reorder the terms:
-27 + 27 + -9n + n2 = 0 + 27

Combine like terms: -27 + 27 = 0
0 + -9n + n2 = 0 + 27
-9n + n2 = 0 + 27

Combine like terms: 0 + 27 = 27
-9n + n2 = 27

The n term is -9n.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9n + 20.25 + n2 = 27 + 20.25

Reorder the terms:
20.25 + -9n + n2 = 27 + 20.25

Combine like terms: 27 + 20.25 = 47.25
20.25 + -9n + n2 = 47.25

Factor a perfect square on the left side:
(n + -4.5)(n + -4.5) = 47.25

Calculate the square root of the right side: 6.873863542

Break this problem into two subproblems by setting 
(n + -4.5) equal to 6.873863542 and -6.873863542.

Subproblem 1

n + -4.5 = 6.873863542 Simplifying n + -4.5 = 6.873863542 Reorder the terms: -4.5 + n = 6.873863542 Solving -4.5 + n = 6.873863542 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + n = 6.873863542 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + n = 6.873863542 + 4.5 n = 6.873863542 + 4.5 Combine like terms: 6.873863542 + 4.5 = 11.373863542 n = 11.373863542 Simplifying n = 11.373863542

Subproblem 2

n + -4.5 = -6.873863542 Simplifying n + -4.5 = -6.873863542 Reorder the terms: -4.5 + n = -6.873863542 Solving -4.5 + n = -6.873863542 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + n = -6.873863542 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + n = -6.873863542 + 4.5 n = -6.873863542 + 4.5 Combine like terms: -6.873863542 + 4.5 = -2.373863542 n = -2.373863542 Simplifying n = -2.373863542

Solution

The solution to the problem is based on the solutions from the subproblems. n = {11.373863542, -2.373863542}

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