.05n+.10n(2n-1)=1.40

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Solution for .05n+.10n(2n-1)=1.40 equation:


Simplifying
0.05n + 0.10n(2n + -1) = 1.40

Reorder the terms:
0.05n + 0.10n(-1 + 2n) = 1.40
0.05n + (-1 * 0.10n + 2n * 0.10n) = 1.40
0.05n + (-0.1n + 0.2n2) = 1.40

Combine like terms: 0.05n + -0.1n = -0.05n
-0.05n + 0.2n2 = 1.40

Solving
-0.05n + 0.2n2 = 1.40

Solving for variable 'n'.

Reorder the terms:
-1.40 + -0.05n + 0.2n2 = 1.40 + -1.40

Combine like terms: 1.40 + -1.40 = 0.00
-1.40 + -0.05n + 0.2n2 = 0.00

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

Divide each side by '0.2'.
-7 + -0.25n + n2 = 0.0

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + -0.25n + 7 + n2 = 0.0 + 7

Reorder the terms:
-7 + 7 + -0.25n + n2 = 0.0 + 7

Combine like terms: -7 + 7 = 0
0 + -0.25n + n2 = 0.0 + 7
-0.25n + n2 = 0.0 + 7

Combine like terms: 0.0 + 7 = 7
-0.25n + n2 = 7

The n term is -0.25n.  Take half its coefficient (-0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
-0.25n + 0.015625 + n2 = 7 + 0.015625

Reorder the terms:
0.015625 + -0.25n + n2 = 7 + 0.015625

Combine like terms: 7 + 0.015625 = 7.015625
0.015625 + -0.25n + n2 = 7.015625

Factor a perfect square on the left side:
(n + -0.125)(n + -0.125) = 7.015625

Calculate the square root of the right side: 2.648702513

Break this problem into two subproblems by setting 
(n + -0.125) equal to 2.648702513 and -2.648702513.

Subproblem 1

n + -0.125 = 2.648702513 Simplifying n + -0.125 = 2.648702513 Reorder the terms: -0.125 + n = 2.648702513 Solving -0.125 + n = 2.648702513 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + n = 2.648702513 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + n = 2.648702513 + 0.125 n = 2.648702513 + 0.125 Combine like terms: 2.648702513 + 0.125 = 2.773702513 n = 2.773702513 Simplifying n = 2.773702513

Subproblem 2

n + -0.125 = -2.648702513 Simplifying n + -0.125 = -2.648702513 Reorder the terms: -0.125 + n = -2.648702513 Solving -0.125 + n = -2.648702513 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + n = -2.648702513 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + n = -2.648702513 + 0.125 n = -2.648702513 + 0.125 Combine like terms: -2.648702513 + 0.125 = -2.523702513 n = -2.523702513 Simplifying n = -2.523702513

Solution

The solution to the problem is based on the solutions from the subproblems. n = {2.773702513, -2.523702513}

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