Question

calcule
(x-1) . (x+7)
(x-8) . (x-10)
(x+2a) . (x+3a)
(x+3/4) . (x-1/3)

Answer 1

2x=7+1

2×=8

×=8÷2

×=4

×2=10+8

2×=18

×=18÷2

x=9

Answer 2

a)x^2 +6x-7

b)x^2-18x+80

c)x^2+5ax+6a^2

d)4/3x^2-4/9x

Espero ter ajudado!