x2 – 13x – 30 = 0

(iii) x² – 13x – 30 = 0

Sol. x² – 13x – 30 = 0

∴ x² – 15x + 2x – 30 = 0

∴ x (x –15) + 2 (x–15) = 0

∴ (x – 15) (x + 2) = 0

∴ x – 15 = 0 or x + 2 = 0

∴ x = 15 or x = –2