x2 – 17x + 60 =0

(iv) x² – 17x + 60 = 0

Sol. x² – 17x + 60 = 0

∴  x² – 12x – 5x + 60 = 0

∴  x(x – 12) – 5(x – 12) = 0

∴ (x – 12) (x – 5) = 0

∴  x – 12 = 0 or x – 5 = 0