Problema 1.36,va rog!!

Δ=b²-4ac
Δ=4(m-1)²-4(m-1)=4(m-1)(m-1-1)=4(m-1)(m-2)=4(m²-3m+2)
m²-3m+2=0
Δ=9-8=1
m₁=2/2=1
m₂=4/2=2
a) m∈(1, 2)