Question

Resolva na fórmula de baskhara 8x²-2x-1=0

Answer 1

8x² - 2x - 1 = 0


∆ = b² - 4.a.c

a = 8
b = -2
c = -1


∆ = (-2)² - 4.8.(-1)
∆ = 4 + 32
∆ = 36


x = -b ± √∆/2.a


x = -(-2) ± √36/2.8

x = 2 ± 6/16

x' = 2 + 6/16 = 8/16 = 1/2

x" = 2 - 6/16 = -4/16 = -1/4



S={ 1/2, -1/4 }