Question

1- Calcule os Binômios


a) (x-12).(x-15) =


b) (x-15-).(x-18)=

c) (2x-50).(3x+12)

d) (-5x+17).(-8x-1)

Answer 1

a)
= (x -12).(x - 15)  
= x² - 15x - 12x + 180
= x² - 27x + 180

b)
= (x - 15).(x - 18)
= x² - 18x - 15x - 15.(-18)
= x² - 33x + 270

c)
= (2x - 50).(3x + 12)
= 2x.3x + 2x.12 - 50.3x - 50.12
= 6x² + 24x - 150x - 600
= 6x² - 126x - 600


d)
= (- 5x + 17).(- 8x - 1)

= - 5x.(-8x) - 5x.(-1) + 17.(-8x) + 17.(-1)

= 40x² + 5x - 136x - 17

= 40x² - 131x - 17