Question

Please help me Evaluate f(x) when (a) x=0 (b) x=2 and (c) x=4
f(x)={x+2 if x<2
2x+1if X greater than or equal to 2

Answer 1

when x=0, is x<2 ??

Answer 2

for x=0 , would u use first (above) function or 2nd (below) function ?

Answer 3

first above i think

Answer 4

thats correct
so put x=0 in x+2
what u get ?

Answer 5

2

Answer 6

that will be f(x) when x=0 :)
now for x=2 , which function to use ?

Answer 7

the second one

Answer 8

great! thats correct :)
so put x= 2 in 2x+1 and tell me what u get.

Answer 9

okay thanks :) and i got 5

Answer 10

that is correct :)
now can u find f(x) when x= 4 ?
which function u'll use ?

Answer 11

2x+1...?

Answer 12

yes, so put x=4 in that and tell me what u get..

Answer 13

?

Answer 14

x=4 okay i get 9...?

Answer 15

thats correct :)
so f(x) =9 when x=4
did u get all 3 parts of solution? any doubts anywhere?

Answer 16

yesss but how do you know which one to use?

Answer 17

when x=0, x<2
so use 1st function
when x=4, x>2
so use 2nd function

Answer 18

how do u know that

Answer 19

thanks by the way:)