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

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


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

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

Multiply (-5 + 4z) * (4 + -1z)
(-5(4 + -1z) + 4z * (4 + -1z)) = 0
((4 * -5 + -1z * -5) + 4z * (4 + -1z)) = 0
((-20 + 5z) + 4z * (4 + -1z)) = 0
(-20 + 5z + (4 * 4z + -1z * 4z)) = 0
(-20 + 5z + (16z + -4z2)) = 0

Combine like terms: 5z + 16z = 21z
(-20 + 21z + -4z2) = 0

Solving
-20 + 21z + -4z2 = 0

Solving for variable 'z'.

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

Subproblem 1

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

Subproblem 2

Set the factor '(5 + -4z)' equal to zero and attempt to solve: Simplifying 5 + -4z = 0 Solving 5 + -4z = 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 + -4z = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -4z = 0 + -5 -4z = 0 + -5 Combine like terms: 0 + -5 = -5 -4z = -5 Divide each side by '-4'. z = 1.25 Simplifying z = 1.25

Solution

z = {4, 1.25}

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