Question

Find the range of each function when the domain is {-2,1,7}
1.f(x)=5-4x
2.f(x)=-1/2x -8

Answer 1

@lgbasallote @Callisto

Answer 2

help! please

Answer 3

replace \(x\) by \(-2\) then by 1, then by 7

Answer 4

your three answers will be the range. for example if \(x=-2\) then
\(.f(x)=5-4x=f(-2)=5-4\times (-2)=5+8=13\)

Answer 5

repeat with 1 and 7, list those answers

Answer 6

so the range would be.... {13,1,-23)?

Answer 7

@satellite73

Answer 8

For
1.f(x)=5-4x
you want to find f(1) and f(7) (sat figured out f(-2) is 13)

to do this, replace x with 1 in 5-4x (remember 4x is short hand for 4*x (4 times x))
5-4*1= 5-4=1

5-4*7= 5-28= -23

so it looks like you got it.