(5z-8)(z+4)=0

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Solution for (5z-8)(z+4)=0 equation:


Simplifying
(5z + -8)(z + 4) = 0

Reorder the terms:
(-8 + 5z)(z + 4) = 0

Reorder the terms:
(-8 + 5z)(4 + z) = 0

Multiply (-8 + 5z) * (4 + z)
(-8(4 + z) + 5z * (4 + z)) = 0
((4 * -8 + z * -8) + 5z * (4 + z)) = 0
((-32 + -8z) + 5z * (4 + z)) = 0
(-32 + -8z + (4 * 5z + z * 5z)) = 0
(-32 + -8z + (20z + 5z2)) = 0

Combine like terms: -8z + 20z = 12z
(-32 + 12z + 5z2) = 0

Solving
-32 + 12z + 5z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(-4 + -1z)(8 + -5z) = 0

Subproblem 1

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

Subproblem 2

Set the factor '(8 + -5z)' equal to zero and attempt to solve: Simplifying 8 + -5z = 0 Solving 8 + -5z = 0 Move all terms containing z to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -5z = 0 + -8 Combine like terms: 8 + -8 = 0 0 + -5z = 0 + -8 -5z = 0 + -8 Combine like terms: 0 + -8 = -8 -5z = -8 Divide each side by '-5'. z = 1.6 Simplifying z = 1.6

Solution

z = {-4, 1.6}

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