(5z+4)(7+z)=0

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Solution for (5z+4)(7+z)=0 equation:


Simplifying
(5z + 4)(7 + z) = 0

Reorder the terms:
(4 + 5z)(7 + z) = 0

Multiply (4 + 5z) * (7 + z)
(4(7 + z) + 5z * (7 + z)) = 0
((7 * 4 + z * 4) + 5z * (7 + z)) = 0
((28 + 4z) + 5z * (7 + z)) = 0
(28 + 4z + (7 * 5z + z * 5z)) = 0
(28 + 4z + (35z + 5z2)) = 0

Combine like terms: 4z + 35z = 39z
(28 + 39z + 5z2) = 0

Solving
28 + 39z + 5z2 = 0

Solving for variable 'z'.

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

Subproblem 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 = -7

Subproblem 2

Set the factor '(4 + 5z)' equal to zero and attempt to solve: Simplifying 4 + 5z = 0 Solving 4 + 5z = 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 + 5z = 0 + -4 Combine like terms: 4 + -4 = 0 0 + 5z = 0 + -4 5z = 0 + -4 Combine like terms: 0 + -4 = -4 5z = -4 Divide each side by '5'. z = -0.8 Simplifying z = -0.8

Solution

z = {-7, -0.8}

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