Question 44907
{{{9x^2 + 12xy + 4y^2 - 25}}}
= {{{(3x)^2 + 2(3x)*(2y) + (2y)^2 - 25}}}
= {{{(3x + 2y)^2 - 5^2}}}
= {{{(3x + 2y + 5)(3x + 2y - 5)}}}