2n^2-11n+3=19

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Solution for 2n^2-11n+3=19 equation:


Simplifying
2n2 + -11n + 3 = 19

Reorder the terms:
3 + -11n + 2n2 = 19

Solving
3 + -11n + 2n2 = 19

Solving for variable 'n'.

Reorder the terms:
3 + -19 + -11n + 2n2 = 19 + -19

Combine like terms: 3 + -19 = -16
-16 + -11n + 2n2 = 19 + -19

Combine like terms: 19 + -19 = 0
-16 + -11n + 2n2 = 0

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

Divide each side by '2'.
-8 + -5.5n + n2 = 0

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -5.5n + 8 + n2 = 0 + 8

Reorder the terms:
-8 + 8 + -5.5n + n2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -5.5n + n2 = 0 + 8
-5.5n + n2 = 0 + 8

Combine like terms: 0 + 8 = 8
-5.5n + n2 = 8

The n term is -5.5n.  Take half its coefficient (-2.75).
Square it (7.5625) and add it to both sides.

Add '7.5625' to each side of the equation.
-5.5n + 7.5625 + n2 = 8 + 7.5625

Reorder the terms:
7.5625 + -5.5n + n2 = 8 + 7.5625

Combine like terms: 8 + 7.5625 = 15.5625
7.5625 + -5.5n + n2 = 15.5625

Factor a perfect square on the left side:
(n + -2.75)(n + -2.75) = 15.5625

Calculate the square root of the right side: 3.94493346

Break this problem into two subproblems by setting 
(n + -2.75) equal to 3.94493346 and -3.94493346.

Subproblem 1

n + -2.75 = 3.94493346 Simplifying n + -2.75 = 3.94493346 Reorder the terms: -2.75 + n = 3.94493346 Solving -2.75 + n = 3.94493346 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + n = 3.94493346 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + n = 3.94493346 + 2.75 n = 3.94493346 + 2.75 Combine like terms: 3.94493346 + 2.75 = 6.69493346 n = 6.69493346 Simplifying n = 6.69493346

Subproblem 2

n + -2.75 = -3.94493346 Simplifying n + -2.75 = -3.94493346 Reorder the terms: -2.75 + n = -3.94493346 Solving -2.75 + n = -3.94493346 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + n = -3.94493346 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + n = -3.94493346 + 2.75 n = -3.94493346 + 2.75 Combine like terms: -3.94493346 + 2.75 = -1.19493346 n = -1.19493346 Simplifying n = -1.19493346

Solution

The solution to the problem is based on the solutions from the subproblems. n = {6.69493346, -1.19493346}

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