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 whereas
for x = 2, the value of the expression is 25 - not a prime.
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4x2 = 8, 8-9 = -1 therefore the answer is "-1"
4x2-36x+81 (2x-9)(2x-9)
No, it has factors... 4x2 + 8x -21 = (2x+7)(2x-3)
Not if x is an integer.
The expression is likely 4x2 - 36x +81 which is the same as (2x - 9)(2x - 9) or (2x - 9)2