How Far is the Final Image from the Object in a Two-Lens System?

[fball558]

Homework Statement

An object is 1.75 m to the left of a lens of focal length 0.62 m. A second lens of focal length -2.7 m is 0.52 m to the right of the first lens. Find the distance between the object and the final image formed by the second lens.

Homework Equations

(1/x1)+(1/image)= (1/focal point 1)

(1/x2 - image) + (1/x3)= (1/focal point 2)

The Attempt at a Solution

i use
x1=1.85
focal 1 = .62
solve for image in first equation

then use

x2=.52
focal 2 = -2.7
use the second equation and solve for x3
and get .526 m
i think I am following the steps right, but keep getting the wrong answer. any help would be great
thanks!

 

[rl.bhat]

In the problem xq1 is 1.75.
What is image distance?