Question

seja f(x) = 2.x² + 10.x + 12, calcule os valores de x de modo que f(x) = 0

Answer 1

Resposta:

f(x) = 2.x² + 10.x + 12 = 0

∆= b²-4.a.c

∆= 10²-4.2.12

∆= 100 - 96

∆= 4

x = - 10 (+ -) √4/ 2. 2

x' = - 10 + 2 / 4 =  -8 / 4 = -2

x'' = - 10 - 2/ 4 = -12/ 4 = -3

S = {-2, -3}