**Colleen wrote:**

I believe I found an error in the answer key in the 5th Ed. Algebra 1 Teachers Guide. On Test 4, #9.d., the answer in the key (p. 88) should be (x – y squared)squared, shouldn’t it, rather than (x + y squared) squared?

**Dr. Callahan answered:**

You are correct. Thanks for pointing it out. The final answer should be

(x-y^2)^2