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Simplifying (z + 1)(z + -5) + -16 = 0 Reorder the terms: (1 + z)(z + -5) + -16 = 0 Reorder the terms: (1 + z)(-5 + z) + -16 = 0 Multiply (1 + z) * (-5 + z) (1(-5 + z) + z(-5 + z)) + -16 = 0 ((-5 * 1 + z * 1) + z(-5 + z)) + -16 = 0 ((-5 + 1z) + z(-5 + z)) + -16 = 0 (-5 + 1z + (-5 * z + z * z)) + -16 = 0 (-5 + 1z + (-5z + z2)) + -16 = 0 Combine like terms: 1z + -5z = -4z (-5 + -4z + z2) + -16 = 0 Reorder the terms: -5 + -16 + -4z + z2 = 0 Combine like terms: -5 + -16 = -21 -21 + -4z + z2 = 0 Solving -21 + -4z + z2 = 0 Solving for variable 'z'. Factor a trinomial. (-3 + -1z)(7 + -1z) = 0Subproblem 1
Set the factor '(-3 + -1z)' equal to zero and attempt to solve: Simplifying -3 + -1z = 0 Solving -3 + -1z = 0 Move all terms containing z to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -1z = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -1z = 0 + 3 -1z = 0 + 3 Combine like terms: 0 + 3 = 3 -1z = 3 Divide each side by '-1'. z = -3 Simplifying z = -3Subproblem 2
Set the factor '(7 + -1z)' equal to zero and attempt to solve: Simplifying 7 + -1z = 0 Solving 7 + -1z = 0 Move all terms containing z to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1z = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1z = 0 + -7 -1z = 0 + -7 Combine like terms: 0 + -7 = -7 -1z = -7 Divide each side by '-1'. z = 7 Simplifying z = 7Solution
z = {-3, 7}
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