find range of f(x)=4x+3 fir the domain {-2,1,4,7}

Question

I neede to help my friend but dont know the answer

 

Answer 1

So the domain is the input (x) values, and the range is the output (or y) values. The problem is asking what y values will you get if you plug in -2, 1, 4, and 7:

 

f(x) = 4x+3

f(-2) = 4(-2) + 3 = -8 + 3 = -5

f(1) = 4(1) + 3 = 4 + 3 = 7

f(4) = 4(4) + 3 = 16 + 3 = 19

f(7) = 4(7) + 3 = 28 + 3 = 31

 

So, the range is the 4 output values we just got: {-5,7,19,31}