Question

Suppose that the functions s and t are defined for all real numbers x as follows.
s(x)=x+1
t(x)=4x+4

Answer 1

Write the expressions for (s*t)(x), (s+t)(x), and evaluate (s-t)(-1)

Answer 2

t(x)=4(x+1).. basically 4 times s(x)

so.. multiply (x+1)*4(x+1) for first part that is s*t

add 'em for the second.

and subtract them for the third and then put x=-1 to evaluate!! simple enough.. post what you get.

Answer 3

first one= 4x^2+8x+4?

Answer 4

ja!!! :) next two??

Answer 5

5x+5?

Answer 6

3x-3?

Answer 7

-3x-3...

Answer 8

wait lol.. :/

Answer 9

Rightie-right....!! (-3x-3 would be right you noticed it good) but, you must put x=-1 in the last part as that is what they have asked you to evaluate

Answer 10

go with the -3x-3

Answer 11

so now I do (-3x-3)(-1)?

Answer 12

no, substitute -1 for the x

Answer 13

crap i cant type -3(-1)-3? 3-3 =0

Answer 14

looks good to me

Answer 15

yeha thats it... its would be '0'.. you did it!!

c'mon ma, have a bit of confidence.. you are doing it alright!!

Answer 16

thank you!