z*z-21z-72=0

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Solution for z*z-21z-72=0 equation:


Simplifying
z * z + -21z + -72 = 0

Multiply z * z
z2 + -21z + -72 = 0

Reorder the terms:
-72 + -21z + z2 = 0

Solving
-72 + -21z + z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(-3 + -1z)(24 + -1z) = 0

Subproblem 1

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

Subproblem 2

Set the factor '(24 + -1z)' equal to zero and attempt to solve: Simplifying 24 + -1z = 0 Solving 24 + -1z = 0 Move all terms containing z to the left, all other terms to the right. Add '-24' to each side of the equation. 24 + -24 + -1z = 0 + -24 Combine like terms: 24 + -24 = 0 0 + -1z = 0 + -24 -1z = 0 + -24 Combine like terms: 0 + -24 = -24 -1z = -24 Divide each side by '-1'. z = 24 Simplifying z = 24

Solution

z = {-3, 24}

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