5(-8+5n)-4n(n-4)=

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Solution for 5(-8+5n)-4n(n-4)= equation:


Simplifying
5(-8 + 5n) + -4n(n + -4) = 0
(-8 * 5 + 5n * 5) + -4n(n + -4) = 0
(-40 + 25n) + -4n(n + -4) = 0

Reorder the terms:
-40 + 25n + -4n(-4 + n) = 0
-40 + 25n + (-4 * -4n + n * -4n) = 0
-40 + 25n + (16n + -4n2) = 0

Combine like terms: 25n + 16n = 41n
-40 + 41n + -4n2 = 0

Solving
-40 + 41n + -4n2 = 0

Solving for variable 'n'.

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

Divide each side by '-4'.
10 + -10.25n + n2 = 0

Move the constant term to the right:

Add '-10' to each side of the equation.
10 + -10.25n + -10 + n2 = 0 + -10

Reorder the terms:
10 + -10 + -10.25n + n2 = 0 + -10

Combine like terms: 10 + -10 = 0
0 + -10.25n + n2 = 0 + -10
-10.25n + n2 = 0 + -10

Combine like terms: 0 + -10 = -10
-10.25n + n2 = -10

The n term is -10.25n.  Take half its coefficient (-5.125).
Square it (26.265625) and add it to both sides.

Add '26.265625' to each side of the equation.
-10.25n + 26.265625 + n2 = -10 + 26.265625

Reorder the terms:
26.265625 + -10.25n + n2 = -10 + 26.265625

Combine like terms: -10 + 26.265625 = 16.265625
26.265625 + -10.25n + n2 = 16.265625

Factor a perfect square on the left side:
(n + -5.125)(n + -5.125) = 16.265625

Calculate the square root of the right side: 4.033066451

Break this problem into two subproblems by setting 
(n + -5.125) equal to 4.033066451 and -4.033066451.

Subproblem 1

n + -5.125 = 4.033066451 Simplifying n + -5.125 = 4.033066451 Reorder the terms: -5.125 + n = 4.033066451 Solving -5.125 + n = 4.033066451 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '5.125' to each side of the equation. -5.125 + 5.125 + n = 4.033066451 + 5.125 Combine like terms: -5.125 + 5.125 = 0.000 0.000 + n = 4.033066451 + 5.125 n = 4.033066451 + 5.125 Combine like terms: 4.033066451 + 5.125 = 9.158066451 n = 9.158066451 Simplifying n = 9.158066451

Subproblem 2

n + -5.125 = -4.033066451 Simplifying n + -5.125 = -4.033066451 Reorder the terms: -5.125 + n = -4.033066451 Solving -5.125 + n = -4.033066451 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '5.125' to each side of the equation. -5.125 + 5.125 + n = -4.033066451 + 5.125 Combine like terms: -5.125 + 5.125 = 0.000 0.000 + n = -4.033066451 + 5.125 n = -4.033066451 + 5.125 Combine like terms: -4.033066451 + 5.125 = 1.091933549 n = 1.091933549 Simplifying n = 1.091933549

Solution

The solution to the problem is based on the solutions from the subproblems. n = {9.158066451, 1.091933549}

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