Question

Qual o valor da equação? X²+×-20

Answer 1

X²+×-20=0

∆ = 1² +4.1.(-20)= 1+ 80= 81 => √∆=9

x = -b+√∆/2a

x = -1±9/2.1

x' = -1-9/2 = -10/2 = -5

x'' = -1+9/2 = 8/2 = 4