(8+z)(4z+5)=0

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Solution for (8+z)(4z+5)=0 equation:


Simplifying
(8 + z)(4z + 5) = 0

Reorder the terms:
(8 + z)(5 + 4z) = 0

Multiply (8 + z) * (5 + 4z)
(8(5 + 4z) + z(5 + 4z)) = 0
((5 * 8 + 4z * 8) + z(5 + 4z)) = 0
((40 + 32z) + z(5 + 4z)) = 0
(40 + 32z + (5 * z + 4z * z)) = 0
(40 + 32z + (5z + 4z2)) = 0

Combine like terms: 32z + 5z = 37z
(40 + 37z + 4z2) = 0

Solving
40 + 37z + 4z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(8 + z)(5 + 4z) = 0

Subproblem 1

Set the factor '(8 + z)' equal to zero and attempt to solve: Simplifying 8 + z = 0 Solving 8 + z = 0 Move all terms containing z to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + z = 0 + -8 Combine like terms: 8 + -8 = 0 0 + z = 0 + -8 z = 0 + -8 Combine like terms: 0 + -8 = -8 z = -8 Simplifying z = -8

Subproblem 2

Set the factor '(5 + 4z)' equal to zero and attempt to solve: Simplifying 5 + 4z = 0 Solving 5 + 4z = 0 Move all terms containing z to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + 4z = 0 + -5 Combine like terms: 5 + -5 = 0 0 + 4z = 0 + -5 4z = 0 + -5 Combine like terms: 0 + -5 = -5 4z = -5 Divide each side by '4'. z = -1.25 Simplifying z = -1.25

Solution

z = {-8, -1.25}

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