(z-3)(4z+7)=0

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Solution for (z-3)(4z+7)=0 equation:


Simplifying
(z + -3)(4z + 7) = 0

Reorder the terms:
(-3 + z)(4z + 7) = 0

Reorder the terms:
(-3 + z)(7 + 4z) = 0

Multiply (-3 + z) * (7 + 4z)
(-3(7 + 4z) + z(7 + 4z)) = 0
((7 * -3 + 4z * -3) + z(7 + 4z)) = 0
((-21 + -12z) + z(7 + 4z)) = 0
(-21 + -12z + (7 * z + 4z * z)) = 0
(-21 + -12z + (7z + 4z2)) = 0

Combine like terms: -12z + 7z = -5z
(-21 + -5z + 4z2) = 0

Solving
-21 + -5z + 4z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(-7 + -4z)(3 + -1z) = 0

Subproblem 1

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

Subproblem 2

Set the factor '(3 + -1z)' equal to zero and attempt to solve: Simplifying 3 + -1z = 0 Solving 3 + -1z = 0 Move all terms containing z to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1z = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1z = 0 + -3 -1z = 0 + -3 Combine like terms: 0 + -3 = -3 -1z = -3 Divide each side by '-1'. z = 3 Simplifying z = 3

Solution

z = {-1.75, 3}

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