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Simplifying (4 + -1z)(2z + 5) = 0 Reorder the terms: (4 + -1z)(5 + 2z) = 0 Multiply (4 + -1z) * (5 + 2z) (4(5 + 2z) + -1z * (5 + 2z)) = 0 ((5 * 4 + 2z * 4) + -1z * (5 + 2z)) = 0 ((20 + 8z) + -1z * (5 + 2z)) = 0 (20 + 8z + (5 * -1z + 2z * -1z)) = 0 (20 + 8z + (-5z + -2z2)) = 0 Combine like terms: 8z + -5z = 3z (20 + 3z + -2z2) = 0 Solving 20 + 3z + -2z2 = 0 Solving for variable 'z'. Factor a trinomial. (4 + -1z)(5 + 2z) = 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 '(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 = -2.5Solution
z = {4, -2.5}
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