Answer :

TheAakash
Let's expand first:
[tex]6z^2+12z+12z^2-30z[/tex]

Simplify (combine like terms):
[tex]18z^2-18z[/tex]
[tex]18z(z-1)[/tex]

So, your most simplified answer is 18z(z-1) or 18z²-18z.

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