Question

${3b + 4a}^{3}$
​

Answer 1

Formula del binomio al cubo

(a-b)³=a³-3a²b+3ab²-b³

(4a-3b)³

  ↓   ↓

  a   b

Si a=4a   y b=3b

Remplazamos en:

a³-3a²b+3ab²-b³

(4a)³-3(4a)²(3b)+3(4a)(3b)²-(3b)³=

64a³-3(16a²)(3b)+3(4a)(9b²)-27b³=

64a³-144a²b+108ab²-27b³

Sol. (4a-3b)³=64a³-144a²b+108ab²-27b³

espero q t sirva