3z^2-30=0

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Well you want to isolate the "z". So the first thing you do is add the 30 to both sides3z^2-30=0+ 30        +303z^2=30Now, divide both sides by 33z^2=30÷ 3      ÷3z^2 = 10Then you take the square root of both sides which will cancel out the "^2"z^2=10√       √z = √10there are three possible answersz ≈ 3.16orz = √2 √5or z = √10It depends on what the question asks you to do.Hope this helps!!