Question

x²-x-4=0 ???? preciso do bhaskara

Answer 1

x²-x-4= 0

a= 1   b= -1    c= -4

Δ= b²-4.a.c

Δ= (-1)²-4.1.(-4)

Δ= 1+16

Δ= 17

x= [-b+-√Δ]/[2.a]

x= [-(-1)+-√17]/[2.1]

x= [1+-√17]/2

x¹= [1-√17]/2

x²= [1+√17]/2

S= {[1-√17]/2, [1+√17]/2} → Resposta:)