Determine whether given polynomial identities are true, and whether given proofs of such identities are valid.

Problem

Which of the following polynomial equations are valid identities?
A, point, space, n, left parenthesis, n, minus, 2, right parenthesis, left parenthesis, n, plus, 2, right parenthesis, equals, n, start superscript, 3, end superscript, minus, 4, n
B, point, space, left parenthesis, x, plus, 1, right parenthesis, start superscript, 2, end superscript, minus, 2, x, plus, y, start superscript, 2, end superscript, equals, x, start superscript, 2, end superscript, plus, y, start superscript, 2, end superscript, plus, 1
Please choose from one of the following options.
Get 3 answers correct in a row