7n^2-39n=-20

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Solution for 7n^2-39n=-20 equation:


Simplifying
7n2 + -39n = -20

Reorder the terms:
-39n + 7n2 = -20

Solving
-39n + 7n2 = -20

Solving for variable 'n'.

Reorder the terms:
20 + -39n + 7n2 = -20 + 20

Combine like terms: -20 + 20 = 0
20 + -39n + 7n2 = 0

Factor a trinomial.
(4 + -7n)(5 + -1n) = 0

Subproblem 1

Set the factor '(4 + -7n)' equal to zero and attempt to solve: Simplifying 4 + -7n = 0 Solving 4 + -7n = 0 Move all terms containing n to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -7n = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -7n = 0 + -4 -7n = 0 + -4 Combine like terms: 0 + -4 = -4 -7n = -4 Divide each side by '-7'. n = 0.5714285714 Simplifying n = 0.5714285714

Subproblem 2

Set the factor '(5 + -1n)' equal to zero and attempt to solve: Simplifying 5 + -1n = 0 Solving 5 + -1n = 0 Move all terms containing n to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -1n = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -1n = 0 + -5 -1n = 0 + -5 Combine like terms: 0 + -5 = -5 -1n = -5 Divide each side by '-1'. n = 5 Simplifying n = 5

Solution

n = {0.5714285714, 5}

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