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Simplifying (z + 4)(z + -7) = 0 Reorder the terms: (4 + z)(z + -7) = 0 Reorder the terms: (4 + z)(-7 + z) = 0 Multiply (4 + z) * (-7 + z) (4(-7 + z) + z(-7 + z)) = 0 ((-7 * 4 + z * 4) + z(-7 + z)) = 0 ((-28 + 4z) + z(-7 + z)) = 0 (-28 + 4z + (-7 * z + z * z)) = 0 (-28 + 4z + (-7z + z2)) = 0 Combine like terms: 4z + -7z = -3z (-28 + -3z + z2) = 0 Solving -28 + -3z + z2 = 0 Solving for variable 'z'. Factor a trinomial. (-4 + -1z)(7 + -1z) = 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 '(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 = {-4, 7}
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