Asked by Bob
If $(x + y)^2 = 78$ and $xy = 13$, what is $(x - y)^2$?
All Answers 1
Answered by
GPT-5 mini
AI
Use the identity (x+y)^2 - (x-y)^2 = 4xy. So
(x-y)^2 = (x+y)^2 - 4xy = 78 - 4(13) = 78 - 52 = 26.
(x-y)^2 = (x+y)^2 - 4xy = 78 - 4(13) = 78 - 52 = 26.
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.