0.1n^2-20n-5100=0

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Solution for 0.1n^2-20n-5100=0 equation:


Simplifying
0.1n2 + -20n + -5100 = 0

Reorder the terms:
-5100 + -20n + 0.1n2 = 0

Solving
-5100 + -20n + 0.1n2 = 0

Solving for variable 'n'.

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

Divide each side by '0.1'.
-51000 + -200n + n2 = 0

Move the constant term to the right:

Add '51000' to each side of the equation.
-51000 + -200n + 51000 + n2 = 0 + 51000

Reorder the terms:
-51000 + 51000 + -200n + n2 = 0 + 51000

Combine like terms: -51000 + 51000 = 0
0 + -200n + n2 = 0 + 51000
-200n + n2 = 0 + 51000

Combine like terms: 0 + 51000 = 51000
-200n + n2 = 51000

The n term is -200n.  Take half its coefficient (-100).
Square it (10000) and add it to both sides.

Add '10000' to each side of the equation.
-200n + 10000 + n2 = 51000 + 10000

Reorder the terms:
10000 + -200n + n2 = 51000 + 10000

Combine like terms: 51000 + 10000 = 61000
10000 + -200n + n2 = 61000

Factor a perfect square on the left side:
(n + -100)(n + -100) = 61000

Calculate the square root of the right side: 246.981780705

Break this problem into two subproblems by setting 
(n + -100) equal to 246.981780705 and -246.981780705.

Subproblem 1

n + -100 = 246.981780705 Simplifying n + -100 = 246.981780705 Reorder the terms: -100 + n = 246.981780705 Solving -100 + n = 246.981780705 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '100' to each side of the equation. -100 + 100 + n = 246.981780705 + 100 Combine like terms: -100 + 100 = 0 0 + n = 246.981780705 + 100 n = 246.981780705 + 100 Combine like terms: 246.981780705 + 100 = 346.981780705 n = 346.981780705 Simplifying n = 346.981780705

Subproblem 2

n + -100 = -246.981780705 Simplifying n + -100 = -246.981780705 Reorder the terms: -100 + n = -246.981780705 Solving -100 + n = -246.981780705 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '100' to each side of the equation. -100 + 100 + n = -246.981780705 + 100 Combine like terms: -100 + 100 = 0 0 + n = -246.981780705 + 100 n = -246.981780705 + 100 Combine like terms: -246.981780705 + 100 = -146.981780705 n = -146.981780705 Simplifying n = -146.981780705

Solution

The solution to the problem is based on the solutions from the subproblems. n = {346.981780705, -146.981780705}

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