Question

упростите выражение 12ab-(2a+3b)*(2a+3b)

Answer 1

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

Answer 2

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