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Simplifying (5z + 9)(4 + -1z) = 0 Reorder the terms: (9 + 5z)(4 + -1z) = 0 Multiply (9 + 5z) * (4 + -1z) (9(4 + -1z) + 5z * (4 + -1z)) = 0 ((4 * 9 + -1z * 9) + 5z * (4 + -1z)) = 0 ((36 + -9z) + 5z * (4 + -1z)) = 0 (36 + -9z + (4 * 5z + -1z * 5z)) = 0 (36 + -9z + (20z + -5z2)) = 0 Combine like terms: -9z + 20z = 11z (36 + 11z + -5z2) = 0 Solving 36 + 11z + -5z2 = 0 Solving for variable 'z'. Factor a trinomial. (4 + -1z)(9 + 5z) = 0Subproblem 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 = 4Subproblem 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 = -1.8Solution
z = {4, -1.8}
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