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Simplifying (4z + -7)(9 + -1z) = 0 Reorder the terms: (-7 + 4z)(9 + -1z) = 0 Multiply (-7 + 4z) * (9 + -1z) (-7(9 + -1z) + 4z * (9 + -1z)) = 0 ((9 * -7 + -1z * -7) + 4z * (9 + -1z)) = 0 ((-63 + 7z) + 4z * (9 + -1z)) = 0 (-63 + 7z + (9 * 4z + -1z * 4z)) = 0 (-63 + 7z + (36z + -4z2)) = 0 Combine like terms: 7z + 36z = 43z (-63 + 43z + -4z2) = 0 Solving -63 + 43z + -4z2 = 0 Solving for variable 'z'. Factor a trinomial. (-9 + z)(7 + -4z) = 0Subproblem 1
Set the factor '(-9 + z)' equal to zero and attempt to solve: Simplifying -9 + z = 0 Solving -9 + z = 0 Move all terms containing z to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + z = 0 + 9 Combine like terms: -9 + 9 = 0 0 + z = 0 + 9 z = 0 + 9 Combine like terms: 0 + 9 = 9 z = 9 Simplifying z = 9Subproblem 2
Set the factor '(7 + -4z)' equal to zero and attempt to solve: Simplifying 7 + -4z = 0 Solving 7 + -4z = 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 + -4z = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -4z = 0 + -7 -4z = 0 + -7 Combine like terms: 0 + -7 = -7 -4z = -7 Divide each side by '-4'. z = 1.75 Simplifying z = 1.75Solution
z = {9, 1.75}
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