Question 269 of 455MediumMCQ
If both roots of x2−mx+4=0 are real, distinct, and lie in [1,5], then m lies in the interval: Solutions · 1
Official solution
Conditions: D>0⟹m∈(−∞,−4)∪(4,∞); vertex in (1,5); f(1)>0⟹m<5; f(5)>0⟹m<529. Combining all gives m∈(4,5). Answer the question to unlock