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Simplifying -9z + 20z2 + -20 = 0 Reorder the terms: -20 + -9z + 20z2 = 0 Solving -20 + -9z + 20z2 = 0 Solving for variable 'z'. Factor a trinomial. (-4 + -5z)(5 + -4z) = 0Subproblem 1
Set the factor '(-4 + -5z)' equal to zero and attempt to solve: Simplifying -4 + -5z = 0 Solving -4 + -5z = 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 + -5z = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -5z = 0 + 4 -5z = 0 + 4 Combine like terms: 0 + 4 = 4 -5z = 4 Divide each side by '-5'. z = -0.8 Simplifying z = -0.8Subproblem 2
Set the factor '(5 + -4z)' equal to zero and attempt to solve: Simplifying 5 + -4z = 0 Solving 5 + -4z = 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 + -4z = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -4z = 0 + -5 -4z = 0 + -5 Combine like terms: 0 + -5 = -5 -4z = -5 Divide each side by '-4'. z = 1.25 Simplifying z = 1.25Solution
z = {-0.8, 1.25}
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