-3(z+5)(-z-4)=0

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Solution for -3(z+5)(-z-4)=0 equation:


Simplifying
-3(z + 5)(-1z + -4) = 0

Reorder the terms:
-3(5 + z)(-1z + -4) = 0

Reorder the terms:
-3(5 + z)(-4 + -1z) = 0

Multiply (5 + z) * (-4 + -1z)
-3(5(-4 + -1z) + z(-4 + -1z)) = 0
-3((-4 * 5 + -1z * 5) + z(-4 + -1z)) = 0
-3((-20 + -5z) + z(-4 + -1z)) = 0
-3(-20 + -5z + (-4 * z + -1z * z)) = 0
-3(-20 + -5z + (-4z + -1z2)) = 0

Combine like terms: -5z + -4z = -9z
-3(-20 + -9z + -1z2) = 0
(-20 * -3 + -9z * -3 + -1z2 * -3) = 0
(60 + 27z + 3z2) = 0

Solving
60 + 27z + 3z2 = 0

Solving for variable 'z'.

Factor out the Greatest Common Factor (GCF), '3'.
3(20 + 9z + z2) = 0

Factor a trinomial.
3((5 + z)(4 + z)) = 0

Ignore the factor 3.

Subproblem 1

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

Subproblem 2

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

Solution

z = {-5, -4}

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