Question

O resultado da expressao algebrica qual o valor (3x-5).(2×-7×+1)

Answer 1

(3x-5).(2×-7×+1)
6x² - 21x² + 3x - 10x + 35x - 5
-15x² - 7x + 35x - 5
-15x² + 28x - 5


Δ= 28² - 4.(-15).(-5)
Δ= 784 - 300
Δ= 484

x= -28 ±√484 / 2.(-15)
x= -28 ± 22 / ( -30 )
x'= -28 + 22 / (-30) = -6/(-30) (÷3) = 2/10
x"= -28 - 22 / (-30) = -50/(-30) (÷10) = 5/3