GRE Exam Programming Functions

Let A = {-1, 0, 2, 3, 5, 6} and f(x) = x^2 -x -2. Find f(A). Indicate all correct options. [x^2 = x*x]
A. {-1, 0, 2, 3, 5, 6}
B. {f(-1), f(0), f(2), f(3), f(5), f(6)}
C. {-2, 4, 18, 28}
D. {0, -2, 4, 18, 28}
E. { 0, 1, 2, 6, 20}

Read Solution (Total 1)

D
f(-1)=0,f(0)=-2....
if we look at the options the set starting with these two values is only option D
so there is no need to solve each value of set A
4 years agoHelpfull: Yes(0) No(0)

GRE Other Question

A and B start from a point and run in opposite directions along the circumference of a circular park. The circumference of the park is 4200 meters. The speeds of A and B are 500 m/min and 700 m/min respectively. Which of the following is true? Indicate all correct options.
A. They meet each other in 3.5 minutes
B. A covers 1750 meters when they meet
C. B covers 1750 meters when they meet
D. A covers 2450 meters when they
E. B covers 2450 meters when they meet A and B can do a piece of work in 24 days, B and C can do it in 30 days and C and A can do it in 40 days. Which of the following statements is true? Indicate all correct options.
A. A takes 40 days to do the work
B. B takes 40 days to do the work
C. C takes 120 days to do the work
D. B takes 120 days to do the work
E. C takes 60 days to do the work