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Simplifying (7 + z)(5z + 9) = 0 Reorder the terms: (7 + z)(9 + 5z) = 0 Multiply (7 + z) * (9 + 5z) (7(9 + 5z) + z(9 + 5z)) = 0 ((9 * 7 + 5z * 7) + z(9 + 5z)) = 0 ((63 + 35z) + z(9 + 5z)) = 0 (63 + 35z + (9 * z + 5z * z)) = 0 (63 + 35z + (9z + 5z2)) = 0 Combine like terms: 35z + 9z = 44z (63 + 44z + 5z2) = 0 Solving 63 + 44z + 5z2 = 0 Solving for variable 'z'. Factor a trinomial. (7 + z)(9 + 5z) = 0Subproblem 1
Set the factor '(7 + z)' equal to zero and attempt to solve: Simplifying 7 + z = 0 Solving 7 + z = 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 + z = 0 + -7 Combine like terms: 7 + -7 = 0 0 + z = 0 + -7 z = 0 + -7 Combine like terms: 0 + -7 = -7 z = -7 Simplifying z = -7Subproblem 2
Set the factor '(9 + 5z)' equal to zero and attempt to solve: Simplifying 9 + 5z = 0 Solving 9 + 5z = 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 + 5z = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 5z = 0 + -9 5z = 0 + -9 Combine like terms: 0 + -9 = -9 5z = -9 Divide each side by '5'. z = -1.8 Simplifying z = -1.8Solution
z = {-7, -1.8}
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