Question

efetue as multiplicaçoes:
a) (x - 8y) × (3x - 4x)
b) (9a - b) × (9a + b)
c) (5ab + 6) × (5ab + c)​

Answer 1

Explicação passo-a-passo:

A)

(x—8y)•(3x—4x)

= 3x²—4x²—24xy+32xy

= x² + 8xy

B)

(9a—b)•(9a+b)

= 81a² + 9ab — 9ab — ab

= 81a² — ab

C)

(5ab+6)•(5ab+c)

= 25a²b²+5abc+30ab+6c

Espero ter ajudado bastante!)