4• Em seu caderno, corrija as sentenças que são falsas. a) (x + 8)² = x² + 64
b) (3x + 5)² = (3x)² + 2 • (3x) • 5 + 5²= 9x² + 30x + 25 
c) (x + 3y)² = x² + 3xy + (3y)² = x² + 3xy + 9y² 

5• Calcule em seu caderno o quadrado da soma nos itens a seguir: 
a) (3x + y)²
b) (3a + 2)² 
c) (4a + y³)² 
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