Which expression is equivalent to this polynomial? 4x^2 + 27
A. (2x + 3(square root of 3i))(2x-3(square root of 3i))
b(2x+9i)(2x-3i)
c(2x+ 3(square root of 3))^2
d(2x+3(square root of 3))(2x-3(square root of 3))