Question

Produtos notáveis

(a-3)^2-3*(a+2)^3=

Answer 1

• $(a+b)^3=a^3+3a^2b+3ab^2+b^3$

• $(a-b)^2=a^2-2ab+b^2$

$(a-3)^2-3(a+2)^3\\\\(a^2-2.a.3+3^2)-3(a^3+3.a^2.2+3.a2^2+2^3)\\\\(a^2-6a+9)-3(a^3+6a^2+12a+8)\\\\a^2-6a+9-3a^3-18a^2-36a-24\\\\-3a^3-17a^2-42a-15$