An error has been made in subtracting the two polynomials shown in the work below. (6x2 - 4x - 5)-(3x2 - 7x + 2) =
6x2 - 4x - 5
--3x2 - 7x = 2
3x2 - 11x - 3
Part A: Explain the error that has been made.
Part B: Show how to correctly subtract the two polynomials.​

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