(5n-4)(n+4)=0

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Solution for (5n-4)(n+4)=0 equation:


Simplifying
(5n + -4)(n + 4) = 0

Reorder the terms:
(-4 + 5n)(n + 4) = 0

Reorder the terms:
(-4 + 5n)(4 + n) = 0

Multiply (-4 + 5n) * (4 + n)
(-4(4 + n) + 5n * (4 + n)) = 0
((4 * -4 + n * -4) + 5n * (4 + n)) = 0
((-16 + -4n) + 5n * (4 + n)) = 0
(-16 + -4n + (4 * 5n + n * 5n)) = 0
(-16 + -4n + (20n + 5n2)) = 0

Combine like terms: -4n + 20n = 16n
(-16 + 16n + 5n2) = 0

Solving
-16 + 16n + 5n2 = 0

Solving for variable 'n'.

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

Subproblem 1

Set the factor '(-4 + -1n)' equal to zero and attempt to solve: Simplifying -4 + -1n = 0 Solving -4 + -1n = 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 + -1n = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -1n = 0 + 4 -1n = 0 + 4 Combine like terms: 0 + 4 = 4 -1n = 4 Divide each side by '-1'. n = -4 Simplifying n = -4

Subproblem 2

Set the factor '(4 + -5n)' equal to zero and attempt to solve: Simplifying 4 + -5n = 0 Solving 4 + -5n = 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 + -5n = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -5n = 0 + -4 -5n = 0 + -4 Combine like terms: 0 + -4 = -4 -5n = -4 Divide each side by '-5'. n = 0.8 Simplifying n = 0.8

Solution

n = {-4, 0.8}

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