-4n^2+6n-16=-15n

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Solution for -4n^2+6n-16=-15n equation:


Simplifying
-4n2 + 6n + -16 = -15n

Reorder the terms:
-16 + 6n + -4n2 = -15n

Solving
-16 + 6n + -4n2 = -15n

Solving for variable 'n'.

Reorder the terms:
-16 + 6n + 15n + -4n2 = -15n + 15n

Combine like terms: 6n + 15n = 21n
-16 + 21n + -4n2 = -15n + 15n

Combine like terms: -15n + 15n = 0
-16 + 21n + -4n2 = 0

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

Divide each side by '-4'.
4 + -5.25n + n2 = 0

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + -5.25n + -4 + n2 = 0 + -4

Reorder the terms:
4 + -4 + -5.25n + n2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -5.25n + n2 = 0 + -4
-5.25n + n2 = 0 + -4

Combine like terms: 0 + -4 = -4
-5.25n + n2 = -4

The n term is -5.25n.  Take half its coefficient (-2.625).
Square it (6.890625) and add it to both sides.

Add '6.890625' to each side of the equation.
-5.25n + 6.890625 + n2 = -4 + 6.890625

Reorder the terms:
6.890625 + -5.25n + n2 = -4 + 6.890625

Combine like terms: -4 + 6.890625 = 2.890625
6.890625 + -5.25n + n2 = 2.890625

Factor a perfect square on the left side:
(n + -2.625)(n + -2.625) = 2.890625

Calculate the square root of the right side: 1.700183814

Break this problem into two subproblems by setting 
(n + -2.625) equal to 1.700183814 and -1.700183814.

Subproblem 1

n + -2.625 = 1.700183814 Simplifying n + -2.625 = 1.700183814 Reorder the terms: -2.625 + n = 1.700183814 Solving -2.625 + n = 1.700183814 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '2.625' to each side of the equation. -2.625 + 2.625 + n = 1.700183814 + 2.625 Combine like terms: -2.625 + 2.625 = 0.000 0.000 + n = 1.700183814 + 2.625 n = 1.700183814 + 2.625 Combine like terms: 1.700183814 + 2.625 = 4.325183814 n = 4.325183814 Simplifying n = 4.325183814

Subproblem 2

n + -2.625 = -1.700183814 Simplifying n + -2.625 = -1.700183814 Reorder the terms: -2.625 + n = -1.700183814 Solving -2.625 + n = -1.700183814 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '2.625' to each side of the equation. -2.625 + 2.625 + n = -1.700183814 + 2.625 Combine like terms: -2.625 + 2.625 = 0.000 0.000 + n = -1.700183814 + 2.625 n = -1.700183814 + 2.625 Combine like terms: -1.700183814 + 2.625 = 0.924816186 n = 0.924816186 Simplifying n = 0.924816186

Solution

The solution to the problem is based on the solutions from the subproblems. n = {4.325183814, 0.924816186}

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