8n(3n+7)=28

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Solution for 8n(3n+7)=28 equation:


Simplifying
8n(3n + 7) = 28

Reorder the terms:
8n(7 + 3n) = 28
(7 * 8n + 3n * 8n) = 28
(56n + 24n2) = 28

Solving
56n + 24n2 = 28

Solving for variable 'n'.

Reorder the terms:
-28 + 56n + 24n2 = 28 + -28

Combine like terms: 28 + -28 = 0
-28 + 56n + 24n2 = 0

Factor out the Greatest Common Factor (GCF), '4'.
4(-7 + 14n + 6n2) = 0

Ignore the factor 4.

Subproblem 1

Set the factor '(-7 + 14n + 6n2)' equal to zero and attempt to solve: Simplifying -7 + 14n + 6n2 = 0 Solving -7 + 14n + 6n2 = 0 Begin completing the square. Divide all terms by 6 the coefficient of the squared term: Divide each side by '6'. -1.166666667 + 2.333333333n + n2 = 0 Move the constant term to the right: Add '1.166666667' to each side of the equation. -1.166666667 + 2.333333333n + 1.166666667 + n2 = 0 + 1.166666667 Reorder the terms: -1.166666667 + 1.166666667 + 2.333333333n + n2 = 0 + 1.166666667 Combine like terms: -1.166666667 + 1.166666667 = 0.000000000 0.000000000 + 2.333333333n + n2 = 0 + 1.166666667 2.333333333n + n2 = 0 + 1.166666667 Combine like terms: 0 + 1.166666667 = 1.166666667 2.333333333n + n2 = 1.166666667 The n term is 2.333333333n. Take half its coefficient (1.166666667). Square it (1.361111112) and add it to both sides. Add '1.361111112' to each side of the equation. 2.333333333n + 1.361111112 + n2 = 1.166666667 + 1.361111112 Reorder the terms: 1.361111112 + 2.333333333n + n2 = 1.166666667 + 1.361111112 Combine like terms: 1.166666667 + 1.361111112 = 2.527777779 1.361111112 + 2.333333333n + n2 = 2.527777779 Factor a perfect square on the left side: (n + 1.166666667)(n + 1.166666667) = 2.527777779 Calculate the square root of the right side: 1.589898669 Break this problem into two subproblems by setting (n + 1.166666667) equal to 1.589898669 and -1.589898669.

Subproblem 1

n + 1.166666667 = 1.589898669 Simplifying n + 1.166666667 = 1.589898669 Reorder the terms: 1.166666667 + n = 1.589898669 Solving 1.166666667 + n = 1.589898669 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1.166666667' to each side of the equation. 1.166666667 + -1.166666667 + n = 1.589898669 + -1.166666667 Combine like terms: 1.166666667 + -1.166666667 = 0.000000000 0.000000000 + n = 1.589898669 + -1.166666667 n = 1.589898669 + -1.166666667 Combine like terms: 1.589898669 + -1.166666667 = 0.423232002 n = 0.423232002 Simplifying n = 0.423232002

Subproblem 2

n + 1.166666667 = -1.589898669 Simplifying n + 1.166666667 = -1.589898669 Reorder the terms: 1.166666667 + n = -1.589898669 Solving 1.166666667 + n = -1.589898669 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1.166666667' to each side of the equation. 1.166666667 + -1.166666667 + n = -1.589898669 + -1.166666667 Combine like terms: 1.166666667 + -1.166666667 = 0.000000000 0.000000000 + n = -1.589898669 + -1.166666667 n = -1.589898669 + -1.166666667 Combine like terms: -1.589898669 + -1.166666667 = -2.756565336 n = -2.756565336 Simplifying n = -2.756565336

Solution

The solution to the problem is based on the solutions from the subproblems. n = {0.423232002, -2.756565336}

Solution

n = {0.423232002, -2.756565336}

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