Question

5aResolva a euaçao do 2a grau
-x2+6x-5=0

a) x'=-1 x''= -5
b) x'=-1 X'=5
c) x'=1 X''=-5
d) x'=-1 X'= -5​

Answer 1

Resposta:

delta= b ^2- 4.a.c

delta= 6^2-4.(-1).(-5)

delta=36 - 20

delta =16

x= - b +- raiz delta/ 2a

x=1 e x= 5