Question

if f(x)=x^1/2-x and g(x)=2x^3-x^1/2, find f(x)-g(x)

Answer 1

i would really appreciate it if someone would actually help me this time!...

Answer 2

ok ill help u

Answer 3

thank you somuch!

Answer 4

this would be your equation
(x^1/2-x)-(2x^3-x^12)

Answer 5

Answers are:
-2x^3-2x-2x^1/2
-2x^3-2x
2x^3-2x+2x^1/2
-2x^3+2x^1/2

Answer 6

okay... my is like my worst subject so, could you explain how to do that? please

Answer 7

math*

Answer 8

is this what the problem looks like?

Answer 9

yes

Answer 10

ok thanks

Answer 11

no problem

Answer 12

??...

Answer 13

umm hmm this one is tough

Answer 14

yeah ik DX

Answer 15

you know that we can write x^1/2 as √x right?

Answer 16

i didnt know that

Answer 17

well you should try and remember that its pretty useful :)

Answer 18

so if we have f(x) - g(x)
we can write this as (√x - x) - (2x^3 - √x)

Answer 19

do you know how you would simplify - (2x^3 - √x)?

Answer 20

thank you so much, math is my worst subject but im almost done with the class. thanks for helping!! (:

Answer 21

let me try, but most likely no

Answer 22

nope i dont

Answer 23

okay so imagine there is a 1 after the - sign so you have to simplify
-1(2x^3 - √x) do you know the FOIL method?

Answer 24

i forgot it havent done it in a while

Answer 25

is it -2x^3+2x^1/2

Answer 26

?

Answer 27

yup! thats correct!

Answer 28

omg thanks so much!!

Answer 29

would you mind helping me out i have three more questions left?

Answer 30

so now we have x^1/2 - x - 2x^3 + x^1/2 and we want to simplify this by collecting like terms

Answer 31

were nearlyyyy finished with this question ahahha

Answer 32

oh haha i thought we were alredy done lol i already went on to the next question

Answer 33

lol dw we're close

Answer 34

can we skip that one ?

Answer 35

A machine is set up to cut metal strips of varying lengths and widths based on the time (t) in minutes. The change in length is given by the function l(t)=t^2 - sq. root of t, and the change in width is given by w(t)=t^2 - 2t 1/2. Which function gives the change in area of the metal strips?

Answer 36

okay do you know formula for the area of a rectangle?

Answer 37

a=wl

Answer 38

Answers:
a(t)=t^4+2t
a(t)=t^4+2t+3t^5/2
a(t)=t^4-3t^5/2+2t
a(t)=t^4+2t-2t^1/2+square root of t

Answer 39

yup so we want to do l(t) x w(t) do you see why?

Answer 40

not really

Answer 41

wait yes i do