(4-z)(5z-9)=0

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Solution for (4-z)(5z-9)=0 equation:


Simplifying
(4 + -1z)(5z + -9) = 0

Reorder the terms:
(4 + -1z)(-9 + 5z) = 0

Multiply (4 + -1z) * (-9 + 5z)
(4(-9 + 5z) + -1z * (-9 + 5z)) = 0
((-9 * 4 + 5z * 4) + -1z * (-9 + 5z)) = 0
((-36 + 20z) + -1z * (-9 + 5z)) = 0
(-36 + 20z + (-9 * -1z + 5z * -1z)) = 0
(-36 + 20z + (9z + -5z2)) = 0

Combine like terms: 20z + 9z = 29z
(-36 + 29z + -5z2) = 0

Solving
-36 + 29z + -5z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(-4 + z)(9 + -5z) = 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 '(9 + -5z)' equal to zero and attempt to solve: Simplifying 9 + -5z = 0 Solving 9 + -5z = 0 Move all terms containing z to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -5z = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -5z = 0 + -9 -5z = 0 + -9 Combine like terms: 0 + -9 = -9 -5z = -9 Divide each side by '-5'. z = 1.8 Simplifying z = 1.8

Solution

z = {4, 1.8}

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