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

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


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

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

Multiply (5 + 4z) * (3 + -1z)
(5(3 + -1z) + 4z * (3 + -1z)) = 0
((3 * 5 + -1z * 5) + 4z * (3 + -1z)) = 0
((15 + -5z) + 4z * (3 + -1z)) = 0
(15 + -5z + (3 * 4z + -1z * 4z)) = 0
(15 + -5z + (12z + -4z2)) = 0

Combine like terms: -5z + 12z = 7z
(15 + 7z + -4z2) = 0

Solving
15 + 7z + -4z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(3 + -1z)(5 + 4z) = 0

Subproblem 1

Set the factor '(3 + -1z)' equal to zero and attempt to solve: Simplifying 3 + -1z = 0 Solving 3 + -1z = 0 Move all terms containing z to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1z = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1z = 0 + -3 -1z = 0 + -3 Combine like terms: 0 + -3 = -3 -1z = -3 Divide each side by '-1'. z = 3 Simplifying z = 3

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 = {3, -1.25}

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