5n^2-2n-10=15

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Solution for 5n^2-2n-10=15 equation:


Simplifying
5n2 + -2n + -10 = 15

Reorder the terms:
-10 + -2n + 5n2 = 15

Solving
-10 + -2n + 5n2 = 15

Solving for variable 'n'.

Reorder the terms:
-10 + -15 + -2n + 5n2 = 15 + -15

Combine like terms: -10 + -15 = -25
-25 + -2n + 5n2 = 15 + -15

Combine like terms: 15 + -15 = 0
-25 + -2n + 5n2 = 0

Begin completing the square.  Divide all terms by
5 the coefficient of the squared term: 

Divide each side by '5'.
-5 + -0.4n + n2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -0.4n + 5 + n2 = 0 + 5

Reorder the terms:
-5 + 5 + -0.4n + n2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -0.4n + n2 = 0 + 5
-0.4n + n2 = 0 + 5

Combine like terms: 0 + 5 = 5
-0.4n + n2 = 5

The n term is -0.4n.  Take half its coefficient (-0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
-0.4n + 0.04 + n2 = 5 + 0.04

Reorder the terms:
0.04 + -0.4n + n2 = 5 + 0.04

Combine like terms: 5 + 0.04 = 5.04
0.04 + -0.4n + n2 = 5.04

Factor a perfect square on the left side:
(n + -0.2)(n + -0.2) = 5.04

Calculate the square root of the right side: 2.244994432

Break this problem into two subproblems by setting 
(n + -0.2) equal to 2.244994432 and -2.244994432.

Subproblem 1

n + -0.2 = 2.244994432 Simplifying n + -0.2 = 2.244994432 Reorder the terms: -0.2 + n = 2.244994432 Solving -0.2 + n = 2.244994432 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + n = 2.244994432 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + n = 2.244994432 + 0.2 n = 2.244994432 + 0.2 Combine like terms: 2.244994432 + 0.2 = 2.444994432 n = 2.444994432 Simplifying n = 2.444994432

Subproblem 2

n + -0.2 = -2.244994432 Simplifying n + -0.2 = -2.244994432 Reorder the terms: -0.2 + n = -2.244994432 Solving -0.2 + n = -2.244994432 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + n = -2.244994432 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + n = -2.244994432 + 0.2 n = -2.244994432 + 0.2 Combine like terms: -2.244994432 + 0.2 = -2.044994432 n = -2.044994432 Simplifying n = -2.044994432

Solution

The solution to the problem is based on the solutions from the subproblems. n = {2.444994432, -2.044994432}

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