That's going to depend on the values of 'x' and 'y',
neither of which is specified in the question.
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x2 - (2x)2 = x2 - 4x2 = -3x2 x2 - 2x2 = -x2
(x2 + 1)(x2 - 2)
1 over x2 - 4 is the multiplicative inverse of x2 minus four 1/x2 - 4
y squared-y-72 is an algebraic expression because it does not contain an equality sign.
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