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Simplifying (4z + -5)(4 + z) = 0 Reorder the terms: (-5 + 4z)(4 + z) = 0 Multiply (-5 + 4z) * (4 + z) (-5(4 + z) + 4z * (4 + z)) = 0 ((4 * -5 + z * -5) + 4z * (4 + z)) = 0 ((-20 + -5z) + 4z * (4 + z)) = 0 (-20 + -5z + (4 * 4z + z * 4z)) = 0 (-20 + -5z + (16z + 4z2)) = 0 Combine like terms: -5z + 16z = 11z (-20 + 11z + 4z2) = 0 Solving -20 + 11z + 4z2 = 0 Solving for variable 'z'. Factor a trinomial. (-4 + -1z)(5 + -4z) = 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 + -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 = {-4, 1.25}
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