Question 761963
Expression is: 9x^2+12xy+4y^2-16z^2

(Using the identity (a+b)^2 = a^2 + 2ab + b^2

{{{9*x^2+12*x*y+4*y^2-16*z^2 = (3*x+2*y)^2 - 16*z^2}}}

Now using the identity (a^2 - b^2) = (a+b)(a-b)

={{{(3*x+2*y+4*z)*(3*x+2*y-4*z)}}}


:)