D 20. Marco wants to show that x³-y - (x-y)x² +xy +y is true for all values of x and y. Marco makes a table with several values of x and y and finds the equation is true every time. Part A: Does Marco's procedure ensure that the equation is a polynomial identity? Explain. Part B: How would you justify that x-y (x-y) is true for all values of x and y? i U Font Family - AA A O F-E - E - O

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