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Part A: x(x - 4) represents the number of tables on all floors.
Part B: THIS IS WHERE I'M CONFUSED

Which step if first to expand it? Do I multiply (x-4)(x-5) first?

yeah, the degree would be three

yes?

I think I understand now, thank you for your help. :)

were the options polynomial, binomial, trinomial etc?
if so, it is slightly different

Yeah, third degree trinomial. I got it thanks.

you do have to expand out the factors to determine the number of terms

The last part is 2nd degree

yes C is 2nd degree, but B is not a trinomial, (it is a cubic)

Oh. Thanks!

there are more than three terms if you expand it out

ax^3 + bx^2 + cx + d

but maybe b c or d is zero?

to expand
x(x - 4)(x - 5)
yeah expand (x - 4)(x - 5), first

\[x^2 - 9x + 20\]

Then you multiply the whole thing by x and get \[x^3 - 9x^2 + 20x\]

yes?

yes good show,

so it was a trinomial after all

ok, good.

yes. great!