(2z+9)(7-z)=0

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Solution for (2z+9)(7-z)=0 equation:


Simplifying
(2z + 9)(7 + -1z) = 0

Reorder the terms:
(9 + 2z)(7 + -1z) = 0

Multiply (9 + 2z) * (7 + -1z)
(9(7 + -1z) + 2z * (7 + -1z)) = 0
((7 * 9 + -1z * 9) + 2z * (7 + -1z)) = 0
((63 + -9z) + 2z * (7 + -1z)) = 0
(63 + -9z + (7 * 2z + -1z * 2z)) = 0
(63 + -9z + (14z + -2z2)) = 0

Combine like terms: -9z + 14z = 5z
(63 + 5z + -2z2) = 0

Solving
63 + 5z + -2z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(7 + -1z)(9 + 2z) = 0

Subproblem 1

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 = 7

Subproblem 2

Set the factor '(9 + 2z)' equal to zero and attempt to solve: Simplifying 9 + 2z = 0 Solving 9 + 2z = 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 + 2z = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 2z = 0 + -9 2z = 0 + -9 Combine like terms: 0 + -9 = -9 2z = -9 Divide each side by '2'. z = -4.5 Simplifying z = -4.5

Solution

z = {7, -4.5}

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