28z^2-33z-28=0

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Solution for 28z^2-33z-28=0 equation:


Simplifying
28z2 + -33z + -28 = 0

Reorder the terms:
-28 + -33z + 28z2 = 0

Solving
-28 + -33z + 28z2 = 0

Solving for variable 'z'.

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

Subproblem 1

Set the factor '(-4 + -7z)' equal to zero and attempt to solve: Simplifying -4 + -7z = 0 Solving -4 + -7z = 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 + -7z = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -7z = 0 + 4 -7z = 0 + 4 Combine like terms: 0 + 4 = 4 -7z = 4 Divide each side by '-7'. z = -0.5714285714 Simplifying z = -0.5714285714

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 = {-0.5714285714, 1.75}

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