(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 = 11z
(36 + 11z + -5z2) = 0

Solving
36 + 11z + -5z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(4 + -1z)(9 + 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 '(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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