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Problem

Which of the following polynomial equations are valid identities?
A, point, space, left parenthesis, 3, x, minus, 2, y, right parenthesis, left parenthesis, 2, y, minus, 3, x, right parenthesis, equals, 9, x, start superscript, 2, end superscript, minus, 4, y, start superscript, 2, end superscript
B, point, space, left parenthesis, 2, k, plus, 5, r, right parenthesis, left parenthesis, 2, k, minus, 5, r, right parenthesis, equals, 4, k, start superscript, 2, end superscript, minus, 25, r, start superscript, 2, end superscript
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