Question

Quadrado da soma de dois termos 
(y³ + 5b)² =

Answer 1

$(y^3+5b)^2=~~\boxed{y^6+10by^3+25b^2}$

Answer 2

(y³ + 5b)² = (y³ + 5b).(y³ + 5b)
y^6 + 5by³ + 5by³ + 25b²
y^6 + 10by³ + 25b²