2n^2+4n=17

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Solution for 2n^2+4n=17 equation:


Simplifying
2n2 + 4n = 17

Reorder the terms:
4n + 2n2 = 17

Solving
4n + 2n2 = 17

Solving for variable 'n'.

Reorder the terms:
-17 + 4n + 2n2 = 17 + -17

Combine like terms: 17 + -17 = 0
-17 + 4n + 2n2 = 0

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

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

Move the constant term to the right:

Add '8.5' to each side of the equation.
-8.5 + 2n + 8.5 + n2 = 0 + 8.5

Reorder the terms:
-8.5 + 8.5 + 2n + n2 = 0 + 8.5

Combine like terms: -8.5 + 8.5 = 0.0
0.0 + 2n + n2 = 0 + 8.5
2n + n2 = 0 + 8.5

Combine like terms: 0 + 8.5 = 8.5
2n + n2 = 8.5

The n term is 2n.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2n + 1 + n2 = 8.5 + 1

Reorder the terms:
1 + 2n + n2 = 8.5 + 1

Combine like terms: 8.5 + 1 = 9.5
1 + 2n + n2 = 9.5

Factor a perfect square on the left side:
(n + 1)(n + 1) = 9.5

Calculate the square root of the right side: 3.082207001

Break this problem into two subproblems by setting 
(n + 1) equal to 3.082207001 and -3.082207001.

Subproblem 1

n + 1 = 3.082207001 Simplifying n + 1 = 3.082207001 Reorder the terms: 1 + n = 3.082207001 Solving 1 + n = 3.082207001 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + n = 3.082207001 + -1 Combine like terms: 1 + -1 = 0 0 + n = 3.082207001 + -1 n = 3.082207001 + -1 Combine like terms: 3.082207001 + -1 = 2.082207001 n = 2.082207001 Simplifying n = 2.082207001

Subproblem 2

n + 1 = -3.082207001 Simplifying n + 1 = -3.082207001 Reorder the terms: 1 + n = -3.082207001 Solving 1 + n = -3.082207001 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + n = -3.082207001 + -1 Combine like terms: 1 + -1 = 0 0 + n = -3.082207001 + -1 n = -3.082207001 + -1 Combine like terms: -3.082207001 + -1 = -4.082207001 n = -4.082207001 Simplifying n = -4.082207001

Solution

The solution to the problem is based on the solutions from the subproblems. n = {2.082207001, -4.082207001}

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