Question

a) (-5a-3)•(7a-7)
b) (3xy+8)•(2xy+9)
c) (x²+5)•(x²-5)​

Answer 1

Respuesta:

a) (-5a-3)•(7a-7) = -35a²+35a-21a+21 = -35a²+14a+21

b) (3xy+8)•(2xy+9) = 6x²y² + 27xy + 16xy + 72 = 6x²y² + 43xy + 72

c) (x²+5)•(x²-5)​ = x⁴-5x²+5x²-25 = x⁴ - 25

Explicación paso a paso:

a) (-5a-3)•(7a-7)

= -35a²+35a-21a+21

= -35a²+14a+21

b) (3xy+8)•(2xy+9)

= 6x²y² + 27xy + 16xy + 72

= 6x²y² + 43xy + 72

c) (x²+5)•(x²-5)​

= x⁴-5x²+5x²-25

= x⁴ - 25