Question

(b+1)ao quadrado+(2b)ao cubo

Answer 1

(b + 1)² + (2b)³

Lembremos que:

(a + b)² = a² + 2.a.b + b²

(b + 1)² = b² + 2.b.1 + 1² = b² + 2b + 1

b² + 2b + 1 + (2b)³

b² + 2b + 1 + 2³b³

b²+ 2b + 1 + 8b³

8b³ + b² + 2b + 1