Question

1)Calcule
A) (a-7).(a-9)
b) (6-5x).(1-2x)
c)(-x + 5).(x+2)
d)(x²+ x-1).(x-1)

Answer 1

Bom dia Emanuelle Teodoro!

A)

(a-7).(a-9)

a²-9a-7a+63

a²-16a+63=0

B)

(6-5x).(1-2x)

6-12x-5x+10x²

10x²-17x+6=0

C)

(-x + 5).(x+2)

-x²-2x+5x+10

-x²+3x+10=0

D)

(x²+ x-1).(x-1)

x³-x²+x²-x-x+1

x³-2x+1=0

Espero ter ajudado!