8n(5n+4)=11

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Solution for 8n(5n+4)=11 equation:


Simplifying
8n(5n + 4) = 11

Reorder the terms:
8n(4 + 5n) = 11
(4 * 8n + 5n * 8n) = 11
(32n + 40n2) = 11

Solving
32n + 40n2 = 11

Solving for variable 'n'.

Reorder the terms:
-11 + 32n + 40n2 = 11 + -11

Combine like terms: 11 + -11 = 0
-11 + 32n + 40n2 = 0

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

Divide each side by '40'.
-0.275 + 0.8n + n2 = 0.0

Move the constant term to the right:

Add '0.275' to each side of the equation.
-0.275 + 0.8n + 0.275 + n2 = 0.0 + 0.275

Reorder the terms:
-0.275 + 0.275 + 0.8n + n2 = 0.0 + 0.275

Combine like terms: -0.275 + 0.275 = 0.000
0.000 + 0.8n + n2 = 0.0 + 0.275
0.8n + n2 = 0.0 + 0.275

Combine like terms: 0.0 + 0.275 = 0.275
0.8n + n2 = 0.275

The n term is 0.8n.  Take half its coefficient (0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
0.8n + 0.16 + n2 = 0.275 + 0.16

Reorder the terms:
0.16 + 0.8n + n2 = 0.275 + 0.16

Combine like terms: 0.275 + 0.16 = 0.435
0.16 + 0.8n + n2 = 0.435

Factor a perfect square on the left side:
(n + 0.4)(n + 0.4) = 0.435

Calculate the square root of the right side: 0.659545298

Break this problem into two subproblems by setting 
(n + 0.4) equal to 0.659545298 and -0.659545298.

Subproblem 1

n + 0.4 = 0.659545298 Simplifying n + 0.4 = 0.659545298 Reorder the terms: 0.4 + n = 0.659545298 Solving 0.4 + n = 0.659545298 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + n = 0.659545298 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + n = 0.659545298 + -0.4 n = 0.659545298 + -0.4 Combine like terms: 0.659545298 + -0.4 = 0.259545298 n = 0.259545298 Simplifying n = 0.259545298

Subproblem 2

n + 0.4 = -0.659545298 Simplifying n + 0.4 = -0.659545298 Reorder the terms: 0.4 + n = -0.659545298 Solving 0.4 + n = -0.659545298 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + n = -0.659545298 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + n = -0.659545298 + -0.4 n = -0.659545298 + -0.4 Combine like terms: -0.659545298 + -0.4 = -1.059545298 n = -1.059545298 Simplifying n = -1.059545298

Solution

The solution to the problem is based on the solutions from the subproblems. n = {0.259545298, -1.059545298}

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