Question

X ao quadra - 8x+7=0

Answer 1

Olá!



x² - 8x + 7 = 0



a = 1
b = -8
c = 7



∆ = (-8)² - 4.1.7
∆ = 64 - 28
∆ = 36


x = -(-8) ± √36/2.1

x = 8 ± 6/2

x' = 8 + 6/2 = 14/2 = 7

x" = 8 - 6/2 = 2/2 = 1



S={ 7, 1 }