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

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


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

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

Multiply (4 + z) * (-5 + 3z)
(4(-5 + 3z) + z(-5 + 3z)) = 0
((-5 * 4 + 3z * 4) + z(-5 + 3z)) = 0
((-20 + 12z) + z(-5 + 3z)) = 0
(-20 + 12z + (-5 * z + 3z * z)) = 0
(-20 + 12z + (-5z + 3z2)) = 0

Combine like terms: 12z + -5z = 7z
(-20 + 7z + 3z2) = 0

Solving
-20 + 7z + 3z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(-4 + -1z)(5 + -3z) = 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 '(5 + -3z)' equal to zero and attempt to solve: Simplifying 5 + -3z = 0 Solving 5 + -3z = 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 + -3z = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -3z = 0 + -5 -3z = 0 + -5 Combine like terms: 0 + -5 = -5 -3z = -5 Divide each side by '-3'. z = 1.666666667 Simplifying z = 1.666666667

Solution

z = {-4, 1.666666667}

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