2n^2-6n-25=0

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Solution for 2n^2-6n-25=0 equation:


Simplifying
2n2 + -6n + -25 = 0

Reorder the terms:
-25 + -6n + 2n2 = 0

Solving
-25 + -6n + 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'.
-12.5 + -3n + n2 = 0

Move the constant term to the right:

Add '12.5' to each side of the equation.
-12.5 + -3n + 12.5 + n2 = 0 + 12.5

Reorder the terms:
-12.5 + 12.5 + -3n + n2 = 0 + 12.5

Combine like terms: -12.5 + 12.5 = 0.0
0.0 + -3n + n2 = 0 + 12.5
-3n + n2 = 0 + 12.5

Combine like terms: 0 + 12.5 = 12.5
-3n + n2 = 12.5

The n term is -3n.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3n + 2.25 + n2 = 12.5 + 2.25

Reorder the terms:
2.25 + -3n + n2 = 12.5 + 2.25

Combine like terms: 12.5 + 2.25 = 14.75
2.25 + -3n + n2 = 14.75

Factor a perfect square on the left side:
(n + -1.5)(n + -1.5) = 14.75

Calculate the square root of the right side: 3.840572874

Break this problem into two subproblems by setting 
(n + -1.5) equal to 3.840572874 and -3.840572874.

Subproblem 1

n + -1.5 = 3.840572874 Simplifying n + -1.5 = 3.840572874 Reorder the terms: -1.5 + n = 3.840572874 Solving -1.5 + n = 3.840572874 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + n = 3.840572874 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + n = 3.840572874 + 1.5 n = 3.840572874 + 1.5 Combine like terms: 3.840572874 + 1.5 = 5.340572874 n = 5.340572874 Simplifying n = 5.340572874

Subproblem 2

n + -1.5 = -3.840572874 Simplifying n + -1.5 = -3.840572874 Reorder the terms: -1.5 + n = -3.840572874 Solving -1.5 + n = -3.840572874 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + n = -3.840572874 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + n = -3.840572874 + 1.5 n = -3.840572874 + 1.5 Combine like terms: -3.840572874 + 1.5 = -2.340572874 n = -2.340572874 Simplifying n = -2.340572874

Solution

The solution to the problem is based on the solutions from the subproblems. n = {5.340572874, -2.340572874}

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