There is an infinite number of such expressions eg x = 1 + 1; x = sqrt 4 etc etc.
I've a feeling you need to be more precise with your wording!
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4x^2 + 9 is a prime algebraic expression. Its numerical value may be prime of not - depending on the value of x.For x = 1, the value of the expression is 13 - a prime whereasfor x = 2, the value of the expression is 25 - not a prime.
It would help if the expression was given!
X2 (5)2 = 25 (- 5)2 = 25 An identity, almost, as any number put into this expression will yield the same value.