Question

Resolver produto notável (3a - 2b) (3a + 2b) - (3a - 2b) (3a - 2b)

Answer 1

 OLá Esmereis,

$(3a-2b)(3a+2b)-(3a-2b)(3a-2b)=\\(9a^2-4b^2)-(3a-2b)^2=\\9a^2-4b^2-(9a^2-12ab+4b^2)=\\9a^2-4b^2-9a^2+12ab-4b^2=\\\boxed{12ab-8b^2}$