Next up... f(x)=x^3-5x, I have rel. max, rel. min, intervals of increase and of decrease, I am unsure of domain and range and need to find the value of f(-4)

Question

anonymous · Answer

Value of f(-4) = -44
The domain and range should be all reals because it is a continuous equation, a polynomial.

anonymous · Answer

How do you get f(-4)?

anonymous · Answer

That just means you plug in -4

anonymous · Answer

See f(x) means you're plugging in x for x; however, f(-4) means you're plugging in -4 for x

anonymous · Answer

oh yeah, first day on this stuff, I forgot.

anonymous · Answer

($$-\infty,\infty)$$

anonymous · Answer

and... ? for range

anonymous · Answer

Same thing, because the graph is going to go up and downwards to infinity

anonymous · Answer

hmmm.. ok thanks!

anonymous · Answer

You can shorten (inf, inf) to R (meaning all real numbers)