2n^2-12n-7=0

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Solution for 2n^2-12n-7=0 equation:


Simplifying
2n2 + -12n + -7 = 0

Reorder the terms:
-7 + -12n + 2n2 = 0

Solving
-7 + -12n + 2n2 = 0

Solving for variable 'n'.

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

Divide each side by '2'.
-3.5 + -6n + n2 = 0

Move the constant term to the right:

Add '3.5' to each side of the equation.
-3.5 + -6n + 3.5 + n2 = 0 + 3.5

Reorder the terms:
-3.5 + 3.5 + -6n + n2 = 0 + 3.5

Combine like terms: -3.5 + 3.5 = 0.0
0.0 + -6n + n2 = 0 + 3.5
-6n + n2 = 0 + 3.5

Combine like terms: 0 + 3.5 = 3.5
-6n + n2 = 3.5

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 = 3.5 + 9

Reorder the terms:
9 + -6n + n2 = 3.5 + 9

Combine like terms: 3.5 + 9 = 12.5
9 + -6n + n2 = 12.5

Factor a perfect square on the left side:
(n + -3)(n + -3) = 12.5

Calculate the square root of the right side: 3.535533906

Break this problem into two subproblems by setting 
(n + -3) equal to 3.535533906 and -3.535533906.

Subproblem 1

n + -3 = 3.535533906 Simplifying n + -3 = 3.535533906 Reorder the terms: -3 + n = 3.535533906 Solving -3 + n = 3.535533906 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 = 3.535533906 + 3 Combine like terms: -3 + 3 = 0 0 + n = 3.535533906 + 3 n = 3.535533906 + 3 Combine like terms: 3.535533906 + 3 = 6.535533906 n = 6.535533906 Simplifying n = 6.535533906

Subproblem 2

n + -3 = -3.535533906 Simplifying n + -3 = -3.535533906 Reorder the terms: -3 + n = -3.535533906 Solving -3 + n = -3.535533906 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 = -3.535533906 + 3 Combine like terms: -3 + 3 = 0 0 + n = -3.535533906 + 3 n = -3.535533906 + 3 Combine like terms: -3.535533906 + 3 = -0.535533906 n = -0.535533906 Simplifying n = -0.535533906

Solution

The solution to the problem is based on the solutions from the subproblems. n = {6.535533906, -0.535533906}

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