Question

Find k given that 4, k, and k^2 - 1 are consecutive terms of a geometric sequence. Please help.

Answer 1

it means that 4*r=k and k*r=k²-1, solve the system of equations

Answer 2

Can you set up the equations?

Answer 3

the equations are those 2
4*r=k
k*r=k²-1,

first equation gives r=k/4, replace in 2nd equation

Answer 4

What does the r stand for?

Answer 5

the ratio, look http://en.wikipedia.org/wiki/Geometric_progression

Answer 6

Okay, thanks so much!!