Answer:
1335.5
Step-by-step explanation:
When you are doing derivatives, you don't want to do it right away because there is still ( ) we need to remove that first get,
g(x)=3x^4-6x
Now we can do the derivatives!
g(x)=12*x^3 - 6
I hope this helps!

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Answer:
8
Step-by-step explanation:

× 8
= 3
In algebra:
× y = 3
y = 3 ÷ 
y = 8