Given the function f(x) = 4 - 2x: If the domain is {-4, 0, 5}, find the range.
A)
{-4, 4, -6}
B)
{-4, 4, 14}
C)
{12, 4, -6}
D)
{12, 4, 14)

Question

Given the function f(x) = 4 - 2x: If the domain is {-4, 0, 5}, find the range.
A)
{-4, 4, -6}	
B)
{-4, 4, 14}	
C)
{12, 4, -6}	
D)
{12, 4, 14)

texaschic101 · Answer

domain is all the x values while the range is all the y values. f(x) is also the same as y.

f(x) = 4 - 2x.......if the domain (x)=-4
sub in -4 for all the x's
f(-4)=4  -2(-4)
f(-4)= 4 + 8
f(-4) = 12
so we know that if the domain (x) is-4 then the range 12

now to find out what the range is when the domain is 0, just sub in 0 for x.
Continue doing this and you will have found your answer.