## vera_ewing one year ago Math question

1. vera_ewing

@Michele_Laino

2. carolinar7

What do you think?

3. Michele_Laino

we can rewrite your function as below: $f\left( x \right) = \left( {3{x^2}} \right) \cdot x$ now $$3x^2$$ is always positive, for every value of $$x$$ (negaitve or positive) So, what can you conclude?

4. Michele_Laino

negative*

5. Michele_Laino

are you sure? if x goes to -infinity, then $$3x^2 \cdot x$$ goes to...?

6. Michele_Laino

I'm sorry, since if x goes to +infinity, then $$3x^2 \cdot x$$ goes to +infinity

7. Michele_Laino

correct!

8. vera_ewing

Ah, thank you Michele!

9. Michele_Laino

:)