intermediate algebra ch 6. 6.1

evaluating rational expressions:

a) find the value of;

4x-1/x+2 for x=-3

4.-3-1/-3+2= -12-1/-3+2= -13/-1=13

b) find the value of;

if R(x)=3x+2/2x-1, find R(4)

3.4+2/2.4-1=12+2=14/7=2

exercises 7-12

7. evaluate; 3x-3/x+5 for x=-2

3.-2-3/-2+5= -9/3=-3

8. evaluate; 3x+1/4x-4 for x=5

3.5+1/4.5-4=15+1/20-4=16/16=1

9. evaluate; if R(x)=2x+9/x find R(3)

2.3+9/3= 15/3=5

10. if R(x)=-20x-2/x-8 find R(-1)

-20.-1-2=-20+2=-18/-1-8=-9 18/9=2

11. if R(x)=X-5/X-3 find r(2),R(-3.02), and R(-2.96).