I need help because I have never learned this it is for my summer work. Please show the work so I know how to do this.

Question

1. Given f(x)= 12x+5, find f(-1)

2. Simplify: indicate the domain and range:
{(1,-5), (-5,4), (6,2), (9,4)}

Answer 1

1)

 f(x)  =  12x + 5

Substitute x = -1 in above function

f(-1)  =  12(-1) + 5

         =  -12 + 5

f(-1)  =  -7

 

2)

The set is {(1,-5), (-5,4), (6,2), (9,4)}

Domain is all the values of x co-ordinates.

Hence, Domain : { -5, 1 , 6, 9 }

Range is all values of y co-ordinates

Hence, Range : {-5, 2, 4}                         [Since need to conseder onlyone value in set]

Answer :

1) f(-1)  =  -7.

2) Domain : { -5, 1 , 6, 9 }

    Range : {-5, 2, 4}.