Question

x a segunda - 8 x mais 12

Answer 1

x² - 8x + 12 = 0

∆= b²-4ac
∆= 64 -4*1*12
∆= 64 - 48
∆= 16


x' = 8 + √16 / 2
x' = 8 + 4/2
x' = 12/2
x' = 6

x" = 8 - √16 / 2
x" = 8-4/2
x" = 4/2
x" = 2

S = { 2,6}