2n^2-12n=-17

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Solution for 2n^2-12n=-17 equation:


Simplifying
2n2 + -12n = -17

Reorder the terms:
-12n + 2n2 = -17

Solving
-12n + 2n2 = -17

Solving for variable 'n'.

Reorder the terms:
17 + -12n + 2n2 = -17 + 17

Combine like terms: -17 + 17 = 0
17 + -12n + 2n2 = 0

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

Divide each side by '2'.
8.5 + -6n + n2 = 0

Move the constant term to the right:

Add '-8.5' to each side of the equation.
8.5 + -6n + -8.5 + n2 = 0 + -8.5

Reorder the terms:
8.5 + -8.5 + -6n + n2 = 0 + -8.5

Combine like terms: 8.5 + -8.5 = 0.0
0.0 + -6n + n2 = 0 + -8.5
-6n + n2 = 0 + -8.5

Combine like terms: 0 + -8.5 = -8.5
-6n + n2 = -8.5

The n term is -6n.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6n + 9 + n2 = -8.5 + 9

Reorder the terms:
9 + -6n + n2 = -8.5 + 9

Combine like terms: -8.5 + 9 = 0.5
9 + -6n + n2 = 0.5

Factor a perfect square on the left side:
(n + -3)(n + -3) = 0.5

Calculate the square root of the right side: 0.707106781

Break this problem into two subproblems by setting 
(n + -3) equal to 0.707106781 and -0.707106781.

Subproblem 1

n + -3 = 0.707106781 Simplifying n + -3 = 0.707106781 Reorder the terms: -3 + n = 0.707106781 Solving -3 + n = 0.707106781 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + n = 0.707106781 + 3 Combine like terms: -3 + 3 = 0 0 + n = 0.707106781 + 3 n = 0.707106781 + 3 Combine like terms: 0.707106781 + 3 = 3.707106781 n = 3.707106781 Simplifying n = 3.707106781

Subproblem 2

n + -3 = -0.707106781 Simplifying n + -3 = -0.707106781 Reorder the terms: -3 + n = -0.707106781 Solving -3 + n = -0.707106781 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + n = -0.707106781 + 3 Combine like terms: -3 + 3 = 0 0 + n = -0.707106781 + 3 n = -0.707106781 + 3 Combine like terms: -0.707106781 + 3 = 2.292893219 n = 2.292893219 Simplifying n = 2.292893219

Solution

The solution to the problem is based on the solutions from the subproblems. n = {3.707106781, 2.292893219}

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