Question

How do we know if a function is 1 to 1. pls explain :)

Answer 1

i tell you

Answer 2

ok

Answer 3

make a horizontal line test like that

Answer 4

take out the derivative of that function and check whether it is increasing or decreasing in that interval

Answer 5

double derivative?
gegomahmed okie and then?

Answer 6

mohamed*

Answer 7

then this is 1 to 1

Answer 8

but

Answer 9

sorry horizontal

Answer 10

okie so if it cuts at one point it means its 1 to 1?

Answer 11

hold on I'll draw it

Answer 12

i'll upload the question

Answer 13

ya u upload the question

Answer 14

the last question. its asking if it has an inverse. the answer is that it does have an inverse since its a 1 to 1 function.

Answer 15

this is 1 to 1

Answer 16

this one not 1 to 1

Answer 17

so its cutting at one point it means its one to one?

Answer 18

yup

Answer 19

and the second one is not?

Answer 20

yeah (y)

Answer 21

okie thanks :) so can u check the question?

Answer 22

sure :D

Answer 23

give me more details about it

Answer 24

where is the question?

Answer 25

here :3

Answer 26

hold on

Answer 27

Dany: Have you considered doing a bit of research on the Internet for information on "one to one" functions?

See the following: http://www.mathwords.com/o/one_to_one_function.htm

Answer 28

i did D: but still didnt understand okie lemme check ur link out :3

Answer 29

try to make graph for the 1st part

Answer 30

yea its the same link dont get it D;

Answer 31

i did make the graph

Answer 32

Would you share your graph, please?