(2z+5)(9-z)=0

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Solution for (2z+5)(9-z)=0 equation:


Simplifying
(2z + 5)(9 + -1z) = 0

Reorder the terms:
(5 + 2z)(9 + -1z) = 0

Multiply (5 + 2z) * (9 + -1z)
(5(9 + -1z) + 2z * (9 + -1z)) = 0
((9 * 5 + -1z * 5) + 2z * (9 + -1z)) = 0
((45 + -5z) + 2z * (9 + -1z)) = 0
(45 + -5z + (9 * 2z + -1z * 2z)) = 0
(45 + -5z + (18z + -2z2)) = 0

Combine like terms: -5z + 18z = 13z
(45 + 13z + -2z2) = 0

Solving
45 + 13z + -2z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(9 + -1z)(5 + 2z) = 0

Subproblem 1

Set the factor '(9 + -1z)' equal to zero and attempt to solve: Simplifying 9 + -1z = 0 Solving 9 + -1z = 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 + -1z = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -1z = 0 + -9 -1z = 0 + -9 Combine like terms: 0 + -9 = -9 -1z = -9 Divide each side by '-1'. z = 9 Simplifying z = 9

Subproblem 2

Set the factor '(5 + 2z)' equal to zero and attempt to solve: Simplifying 5 + 2z = 0 Solving 5 + 2z = 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 + 2z = 0 + -5 Combine like terms: 5 + -5 = 0 0 + 2z = 0 + -5 2z = 0 + -5 Combine like terms: 0 + -5 = -5 2z = -5 Divide each side by '2'. z = -2.5 Simplifying z = -2.5

Solution

z = {9, -2.5}

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