John was working on a polynomial subtraction problem, and his work is shown. (3x^2+4x-8)-(x^2-5x+4)
3x^2+4x-8-x^2-5x+4
2x^2-x-4
John's work is wrong. Explain clearly where he made the mistake. What should the correct answer be?
I worked out the problem myself but still got the same answer to the question.
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