2n^2-9n+5=0

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Solution for 2n^2-9n+5=0 equation:


Simplifying
2n2 + -9n + 5 = 0

Reorder the terms:
5 + -9n + 2n2 = 0

Solving
5 + -9n + 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'.
2.5 + -4.5n + n2 = 0

Move the constant term to the right:

Add '-2.5' to each side of the equation.
2.5 + -4.5n + -2.5 + n2 = 0 + -2.5

Reorder the terms:
2.5 + -2.5 + -4.5n + n2 = 0 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + -4.5n + n2 = 0 + -2.5
-4.5n + n2 = 0 + -2.5

Combine like terms: 0 + -2.5 = -2.5
-4.5n + n2 = -2.5

The n term is -4.5n.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5n + 5.0625 + n2 = -2.5 + 5.0625

Reorder the terms:
5.0625 + -4.5n + n2 = -2.5 + 5.0625

Combine like terms: -2.5 + 5.0625 = 2.5625
5.0625 + -4.5n + n2 = 2.5625

Factor a perfect square on the left side:
(n + -2.25)(n + -2.25) = 2.5625

Calculate the square root of the right side: 1.600781059

Break this problem into two subproblems by setting 
(n + -2.25) equal to 1.600781059 and -1.600781059.

Subproblem 1

n + -2.25 = 1.600781059 Simplifying n + -2.25 = 1.600781059 Reorder the terms: -2.25 + n = 1.600781059 Solving -2.25 + n = 1.600781059 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + n = 1.600781059 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + n = 1.600781059 + 2.25 n = 1.600781059 + 2.25 Combine like terms: 1.600781059 + 2.25 = 3.850781059 n = 3.850781059 Simplifying n = 3.850781059

Subproblem 2

n + -2.25 = -1.600781059 Simplifying n + -2.25 = -1.600781059 Reorder the terms: -2.25 + n = -1.600781059 Solving -2.25 + n = -1.600781059 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + n = -1.600781059 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + n = -1.600781059 + 2.25 n = -1.600781059 + 2.25 Combine like terms: -1.600781059 + 2.25 = 0.649218941 n = 0.649218941 Simplifying n = 0.649218941

Solution

The solution to the problem is based on the solutions from the subproblems. n = {3.850781059, 0.649218941}

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