Urgent with finding rate of change

When working with functions (of all types), the average rate of change is expressed using function notation:

For the interval from x=7 to x=8,

1. find f(7) and f(8):

2. use given formula:

the average rate of change for the interval from x=7 to x=8 is 4374.

set each factor equal to 0

4x-3 = 0

2x-1 = 0

solve for x.

4x-3=0

4x=3

x= 3/4

solve for x. 

2x-1= 0

2x= 1

x= 1/2

your answer should be 1/2 is less than or equal to x and 3/4 is greater than or equal to x