and typed in different commands and none of them seem to be working.

when i integrate sin(x) it just says ".989992"

when i did expand((x+4)^4,x) it just says "2401."

when i do factor(x^2-9,x) it says "0"

so i tried factor(x^2-9=0,x) and it says "true"

the only thing that worked so far is:

solve(x^2-9=0,x) and came out as "x=-3 or x=3"

even though that website didnt tell me to put that in

does anybody know how to fix this?

i have ti-89 titanium OS 3.1 hardware version 4.00