Question

me ajudem por favor ! quanto e (3/4x+2/5y)^2

Answer 1

(3x/4 + 2/5y)² = 
(3x/4)² + 2.3x/4.2/5y + (2/5y)² =
9x²/16 + 6x/4 . 2/5y + 4/25y² = 
9x²/16 + 12x/20y + 4/25y² =
9x²/16 + 3x/5y + 4/25y²