Question 636372
{{{4x^2+9}}}

{{{2^2x^2+3^2}}}

{{{(2x)^2+3^2}}}.......form the difference of squares by multiplying term {{{3}}} by {{{i^2}}}

{{{(2x)^2-(3i)^2}}}

{{{(2x - 3i) (2x + 3i)}}} where i ≡ √(-1)