7n+4n(n-2)=124

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Solution for 7n+4n(n-2)=124 equation:


Simplifying
7n + 4n(n + -2) = 124

Reorder the terms:
7n + 4n(-2 + n) = 124
7n + (-2 * 4n + n * 4n) = 124
7n + (-8n + 4n2) = 124

Combine like terms: 7n + -8n = -1n
-1n + 4n2 = 124

Solving
-1n + 4n2 = 124

Solving for variable 'n'.

Reorder the terms:
-124 + -1n + 4n2 = 124 + -124

Combine like terms: 124 + -124 = 0
-124 + -1n + 4n2 = 0

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

Divide each side by '4'.
-31 + -0.25n + n2 = 0

Move the constant term to the right:

Add '31' to each side of the equation.
-31 + -0.25n + 31 + n2 = 0 + 31

Reorder the terms:
-31 + 31 + -0.25n + n2 = 0 + 31

Combine like terms: -31 + 31 = 0
0 + -0.25n + n2 = 0 + 31
-0.25n + n2 = 0 + 31

Combine like terms: 0 + 31 = 31
-0.25n + n2 = 31

The n term is -0.25n.  Take half its coefficient (-0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
-0.25n + 0.015625 + n2 = 31 + 0.015625

Reorder the terms:
0.015625 + -0.25n + n2 = 31 + 0.015625

Combine like terms: 31 + 0.015625 = 31.015625
0.015625 + -0.25n + n2 = 31.015625

Factor a perfect square on the left side:
(n + -0.125)(n + -0.125) = 31.015625

Calculate the square root of the right side: 5.569167352

Break this problem into two subproblems by setting 
(n + -0.125) equal to 5.569167352 and -5.569167352.

Subproblem 1

n + -0.125 = 5.569167352 Simplifying n + -0.125 = 5.569167352 Reorder the terms: -0.125 + n = 5.569167352 Solving -0.125 + n = 5.569167352 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + n = 5.569167352 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + n = 5.569167352 + 0.125 n = 5.569167352 + 0.125 Combine like terms: 5.569167352 + 0.125 = 5.694167352 n = 5.694167352 Simplifying n = 5.694167352

Subproblem 2

n + -0.125 = -5.569167352 Simplifying n + -0.125 = -5.569167352 Reorder the terms: -0.125 + n = -5.569167352 Solving -0.125 + n = -5.569167352 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + n = -5.569167352 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + n = -5.569167352 + 0.125 n = -5.569167352 + 0.125 Combine like terms: -5.569167352 + 0.125 = -5.444167352 n = -5.444167352 Simplifying n = -5.444167352

Solution

The solution to the problem is based on the solutions from the subproblems. n = {5.694167352, -5.444167352}

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