n^2+10n+25=40

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Solution for n^2+10n+25=40 equation:


Simplifying
n2 + 10n + 25 = 40

Reorder the terms:
25 + 10n + n2 = 40

Solving
25 + 10n + n2 = 40

Solving for variable 'n'.

Reorder the terms:
25 + -40 + 10n + n2 = 40 + -40

Combine like terms: 25 + -40 = -15
-15 + 10n + n2 = 40 + -40

Combine like terms: 40 + -40 = 0
-15 + 10n + n2 = 0

Begin completing the square.

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + 10n + 15 + n2 = 0 + 15

Reorder the terms:
-15 + 15 + 10n + n2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + 10n + n2 = 0 + 15
10n + n2 = 0 + 15

Combine like terms: 0 + 15 = 15
10n + n2 = 15

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 = 15 + 25

Reorder the terms:
25 + 10n + n2 = 15 + 25

Combine like terms: 15 + 25 = 40
25 + 10n + n2 = 40

Factor a perfect square on the left side:
(n + 5)(n + 5) = 40

Calculate the square root of the right side: 6.32455532

Break this problem into two subproblems by setting 
(n + 5) equal to 6.32455532 and -6.32455532.

Subproblem 1

n + 5 = 6.32455532 Simplifying n + 5 = 6.32455532 Reorder the terms: 5 + n = 6.32455532 Solving 5 + n = 6.32455532 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 = 6.32455532 + -5 Combine like terms: 5 + -5 = 0 0 + n = 6.32455532 + -5 n = 6.32455532 + -5 Combine like terms: 6.32455532 + -5 = 1.32455532 n = 1.32455532 Simplifying n = 1.32455532

Subproblem 2

n + 5 = -6.32455532 Simplifying n + 5 = -6.32455532 Reorder the terms: 5 + n = -6.32455532 Solving 5 + n = -6.32455532 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 = -6.32455532 + -5 Combine like terms: 5 + -5 = 0 0 + n = -6.32455532 + -5 n = -6.32455532 + -5 Combine like terms: -6.32455532 + -5 = -11.32455532 n = -11.32455532 Simplifying n = -11.32455532

Solution

The solution to the problem is based on the solutions from the subproblems. n = {1.32455532, -11.32455532}

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