Question

Factor of 4-(2a+3b)^2

Answer 1

$4-(2a+3b)^2$

$(2a+3b)^2 :$

$4a^2+12ab+9b^2$

$= 4-(4a^3+12ab+9b^2)$

$=-(4a^2)-(12ab)-(9b^2)$

apply minus -  plus rules :

$+(-a)=-a$

Refine:

$=-4-4a^2-12ab-9b^2$

hope this helps!