(n-4)4.3n-2.1=15

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Solution for (n-4)4.3n-2.1=15 equation:


Simplifying
(n + -4) * 4.3n + -2.1 = 15

Reorder the terms:
(-4 + n) * 4.3n + -2.1 = 15

Reorder the terms for easier multiplication:
4.3n(-4 + n) + -2.1 = 15
(-4 * 4.3n + n * 4.3n) + -2.1 = 15
(-17.2n + 4.3n2) + -2.1 = 15

Reorder the terms:
-2.1 + -17.2n + 4.3n2 = 15

Solving
-2.1 + -17.2n + 4.3n2 = 15

Solving for variable 'n'.

Reorder the terms:
-2.1 + -15 + -17.2n + 4.3n2 = 15 + -15

Combine like terms: -2.1 + -15 = -17.1
-17.1 + -17.2n + 4.3n2 = 15 + -15

Combine like terms: 15 + -15 = 0
-17.1 + -17.2n + 4.3n2 = 0

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

Divide each side by '4.3'.
-3.976744186 + -4n + n2 = 0

Move the constant term to the right:

Add '3.976744186' to each side of the equation.
-3.976744186 + -4n + 3.976744186 + n2 = 0 + 3.976744186

Reorder the terms:
-3.976744186 + 3.976744186 + -4n + n2 = 0 + 3.976744186

Combine like terms: -3.976744186 + 3.976744186 = 0.000000000
0.000000000 + -4n + n2 = 0 + 3.976744186
-4n + n2 = 0 + 3.976744186

Combine like terms: 0 + 3.976744186 = 3.976744186
-4n + n2 = 3.976744186

The n term is -4n.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4n + 4 + n2 = 3.976744186 + 4

Reorder the terms:
4 + -4n + n2 = 3.976744186 + 4

Combine like terms: 3.976744186 + 4 = 7.976744186
4 + -4n + n2 = 7.976744186

Factor a perfect square on the left side:
(n + -2)(n + -2) = 7.976744186

Calculate the square root of the right side: 2.824313047

Break this problem into two subproblems by setting 
(n + -2) equal to 2.824313047 and -2.824313047.

Subproblem 1

n + -2 = 2.824313047 Simplifying n + -2 = 2.824313047 Reorder the terms: -2 + n = 2.824313047 Solving -2 + n = 2.824313047 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + n = 2.824313047 + 2 Combine like terms: -2 + 2 = 0 0 + n = 2.824313047 + 2 n = 2.824313047 + 2 Combine like terms: 2.824313047 + 2 = 4.824313047 n = 4.824313047 Simplifying n = 4.824313047

Subproblem 2

n + -2 = -2.824313047 Simplifying n + -2 = -2.824313047 Reorder the terms: -2 + n = -2.824313047 Solving -2 + n = -2.824313047 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + n = -2.824313047 + 2 Combine like terms: -2 + 2 = 0 0 + n = -2.824313047 + 2 n = -2.824313047 + 2 Combine like terms: -2.824313047 + 2 = -0.824313047 n = -0.824313047 Simplifying n = -0.824313047

Solution

The solution to the problem is based on the solutions from the subproblems. n = {4.824313047, -0.824313047}

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