3n^2-56=4+20n

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Solution for 3n^2-56=4+20n equation:


Simplifying
3n2 + -56 = 4 + 20n

Reorder the terms:
-56 + 3n2 = 4 + 20n

Solving
-56 + 3n2 = 4 + 20n

Solving for variable 'n'.

Reorder the terms:
-56 + -4 + -20n + 3n2 = 4 + 20n + -4 + -20n

Combine like terms: -56 + -4 = -60
-60 + -20n + 3n2 = 4 + 20n + -4 + -20n

Reorder the terms:
-60 + -20n + 3n2 = 4 + -4 + 20n + -20n

Combine like terms: 4 + -4 = 0
-60 + -20n + 3n2 = 0 + 20n + -20n
-60 + -20n + 3n2 = 20n + -20n

Combine like terms: 20n + -20n = 0
-60 + -20n + 3n2 = 0

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

Divide each side by '3'.
-20 + -6.666666667n + n2 = 0

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + -6.666666667n + 20 + n2 = 0 + 20

Reorder the terms:
-20 + 20 + -6.666666667n + n2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + -6.666666667n + n2 = 0 + 20
-6.666666667n + n2 = 0 + 20

Combine like terms: 0 + 20 = 20
-6.666666667n + n2 = 20

The n term is -6.666666667n.  Take half its coefficient (-3.333333334).
Square it (11.11111112) and add it to both sides.

Add '11.11111112' to each side of the equation.
-6.666666667n + 11.11111112 + n2 = 20 + 11.11111112

Reorder the terms:
11.11111112 + -6.666666667n + n2 = 20 + 11.11111112

Combine like terms: 20 + 11.11111112 = 31.11111112
11.11111112 + -6.666666667n + n2 = 31.11111112

Factor a perfect square on the left side:
(n + -3.333333334)(n + -3.333333334) = 31.11111112

Calculate the square root of the right side: 5.577733511

Break this problem into two subproblems by setting 
(n + -3.333333334) equal to 5.577733511 and -5.577733511.

Subproblem 1

n + -3.333333334 = 5.577733511 Simplifying n + -3.333333334 = 5.577733511 Reorder the terms: -3.333333334 + n = 5.577733511 Solving -3.333333334 + n = 5.577733511 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '3.333333334' to each side of the equation. -3.333333334 + 3.333333334 + n = 5.577733511 + 3.333333334 Combine like terms: -3.333333334 + 3.333333334 = 0.000000000 0.000000000 + n = 5.577733511 + 3.333333334 n = 5.577733511 + 3.333333334 Combine like terms: 5.577733511 + 3.333333334 = 8.911066845 n = 8.911066845 Simplifying n = 8.911066845

Subproblem 2

n + -3.333333334 = -5.577733511 Simplifying n + -3.333333334 = -5.577733511 Reorder the terms: -3.333333334 + n = -5.577733511 Solving -3.333333334 + n = -5.577733511 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '3.333333334' to each side of the equation. -3.333333334 + 3.333333334 + n = -5.577733511 + 3.333333334 Combine like terms: -3.333333334 + 3.333333334 = 0.000000000 0.000000000 + n = -5.577733511 + 3.333333334 n = -5.577733511 + 3.333333334 Combine like terms: -5.577733511 + 3.333333334 = -2.244400177 n = -2.244400177 Simplifying n = -2.244400177

Solution

The solution to the problem is based on the solutions from the subproblems. n = {8.911066845, -2.244400177}

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