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

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


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

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

Multiply (-7 + 4z) * (5 + z)
(-7(5 + z) + 4z * (5 + z)) = 0
((5 * -7 + z * -7) + 4z * (5 + z)) = 0
((-35 + -7z) + 4z * (5 + z)) = 0
(-35 + -7z + (5 * 4z + z * 4z)) = 0
(-35 + -7z + (20z + 4z2)) = 0

Combine like terms: -7z + 20z = 13z
(-35 + 13z + 4z2) = 0

Solving
-35 + 13z + 4z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(-5 + -1z)(7 + -4z) = 0

Subproblem 1

Set the factor '(-5 + -1z)' equal to zero and attempt to solve: Simplifying -5 + -1z = 0 Solving -5 + -1z = 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 + -1z = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -1z = 0 + 5 -1z = 0 + 5 Combine like terms: 0 + 5 = 5 -1z = 5 Divide each side by '-1'. z = -5 Simplifying z = -5

Subproblem 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 = 1.75

Solution

z = {-5, 1.75}

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