Question

(3a-5m)²
(x²+3y)³
(m+n)²

Answer 1

(3a -5m)² = (3a)² -2(3a)(5m) +(5m)² = 9a -30am +25m²

(x² +3y)³ = (x²)³ +3(x²)²(3y) +3(x²)(3y)² +(3y)³ = x⁶ + 9x⁴y +3x²(9y²) +27y³=
x⁶ +9x⁴y+27x²y² +27y³

( m +n)² = m² +2mn +n²

aplicamos productos notables
(a +b)² = a² +2ab +b²
( a -b)² = a² -2ab +b²
(a +b)³ = a³ + 3a²b +3ab² +b³