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Algebra Test 4 #9d

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