Question

(4a-b) ao cubo (4a+b)

Answer 1

(4*a-b)^3*(4*a+b)={4*a^3+3*(4)*a^2*(-b)+3*(4)*a*(-b)^2+(-b)^3]*(4*a+b)
[4*a^3-12*a^2*(b)+12*a*b^2-b^3]*[4*a + b]     ⇒aplico a distributiva 
{16*a^4-48*a^3*b+48*a^2*b^2-4*a*b^3 +4*a^3*b-12*a^2*b^2+12*a*b^3-b^4}=
16*a^4-44*a^3*b+36*a^2*b^2+8*a*b^3-b^4