N^2-10N-73=-9

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Solution for N^2-10N-73=-9 equation:


Simplifying
N2 + -10N + -73 = -9

Reorder the terms:
-73 + -10N + N2 = -9

Solving
-73 + -10N + N2 = -9

Solving for variable 'N'.

Reorder the terms:
-73 + 9 + -10N + N2 = -9 + 9

Combine like terms: -73 + 9 = -64
-64 + -10N + N2 = -9 + 9

Combine like terms: -9 + 9 = 0
-64 + -10N + N2 = 0

Begin completing the square.

Move the constant term to the right:

Add '64' to each side of the equation.
-64 + -10N + 64 + N2 = 0 + 64

Reorder the terms:
-64 + 64 + -10N + N2 = 0 + 64

Combine like terms: -64 + 64 = 0
0 + -10N + N2 = 0 + 64
-10N + N2 = 0 + 64

Combine like terms: 0 + 64 = 64
-10N + N2 = 64

The N term is -10N.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10N + 25 + N2 = 64 + 25

Reorder the terms:
25 + -10N + N2 = 64 + 25

Combine like terms: 64 + 25 = 89
25 + -10N + N2 = 89

Factor a perfect square on the left side:
(N + -5)(N + -5) = 89

Calculate the square root of the right side: 9.433981132

Break this problem into two subproblems by setting 
(N + -5) equal to 9.433981132 and -9.433981132.

Subproblem 1

N + -5 = 9.433981132 Simplifying N + -5 = 9.433981132 Reorder the terms: -5 + N = 9.433981132 Solving -5 + N = 9.433981132 Solving for variable 'N'. Move all terms containing N to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + N = 9.433981132 + 5 Combine like terms: -5 + 5 = 0 0 + N = 9.433981132 + 5 N = 9.433981132 + 5 Combine like terms: 9.433981132 + 5 = 14.433981132 N = 14.433981132 Simplifying N = 14.433981132

Subproblem 2

N + -5 = -9.433981132 Simplifying N + -5 = -9.433981132 Reorder the terms: -5 + N = -9.433981132 Solving -5 + N = -9.433981132 Solving for variable 'N'. Move all terms containing N to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + N = -9.433981132 + 5 Combine like terms: -5 + 5 = 0 0 + N = -9.433981132 + 5 N = -9.433981132 + 5 Combine like terms: -9.433981132 + 5 = -4.433981132 N = -4.433981132 Simplifying N = -4.433981132

Solution

The solution to the problem is based on the solutions from the subproblems. N = {14.433981132, -4.433981132}

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