Question

Determine os zeros reais das funcoes
- x² +7x-12

Answer 1

Δ = 49 - 48 
Δ = 1 

x = - 7 +-√1/-2
x = -7 +-1/-2

x' = -7+1/-2
x' = -6/-2 = 3

x'' = -7-1/-2
x'' = -8/-2 = 4                                ok