n^2+2n=0.65

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Solution for n^2+2n=0.65 equation:


Simplifying
n2 + 2n = 0.65

Reorder the terms:
2n + n2 = 0.65

Solving
2n + n2 = 0.65

Solving for variable 'n'.

Reorder the terms:
-0.65 + 2n + n2 = 0.65 + -0.65

Combine like terms: 0.65 + -0.65 = 0.00
-0.65 + 2n + n2 = 0.00

Begin completing the square.

Move the constant term to the right:

Add '0.65' to each side of the equation.
-0.65 + 2n + 0.65 + n2 = 0.00 + 0.65

Reorder the terms:
-0.65 + 0.65 + 2n + n2 = 0.00 + 0.65

Combine like terms: -0.65 + 0.65 = 0.00
0.00 + 2n + n2 = 0.00 + 0.65
2n + n2 = 0.00 + 0.65

Combine like terms: 0.00 + 0.65 = 0.65
2n + n2 = 0.65

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 = 0.65 + 1

Reorder the terms:
1 + 2n + n2 = 0.65 + 1

Combine like terms: 0.65 + 1 = 1.65
1 + 2n + n2 = 1.65

Factor a perfect square on the left side:
(n + 1)(n + 1) = 1.65

Calculate the square root of the right side: 1.284523258

Break this problem into two subproblems by setting 
(n + 1) equal to 1.284523258 and -1.284523258.

Subproblem 1

n + 1 = 1.284523258 Simplifying n + 1 = 1.284523258 Reorder the terms: 1 + n = 1.284523258 Solving 1 + n = 1.284523258 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 = 1.284523258 + -1 Combine like terms: 1 + -1 = 0 0 + n = 1.284523258 + -1 n = 1.284523258 + -1 Combine like terms: 1.284523258 + -1 = 0.284523258 n = 0.284523258 Simplifying n = 0.284523258

Subproblem 2

n + 1 = -1.284523258 Simplifying n + 1 = -1.284523258 Reorder the terms: 1 + n = -1.284523258 Solving 1 + n = -1.284523258 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 = -1.284523258 + -1 Combine like terms: 1 + -1 = 0 0 + n = -1.284523258 + -1 n = -1.284523258 + -1 Combine like terms: -1.284523258 + -1 = -2.284523258 n = -2.284523258 Simplifying n = -2.284523258

Solution

The solution to the problem is based on the solutions from the subproblems. n = {0.284523258, -2.284523258}

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