IBPS Clerk Prelims Model Paper 11

(2x+5)2 × (4x — 1) — (3x3—16x2+25x—21)
= (4x2+20x+25) (4x — 1)
= 4x (4x2+20x+25) — 1 (4x2+20x+25)—3x3+16x2 — 25x + 21
= 16x3+80x2 + 100x — 4x2 — 20x — 25 — 3x3+16x2 — 25x + 21
= (16 — 3) x3 +(40 — 4 + 16) x2 + (100 — 10 — 25) x — 25 + 21
= 13 x3 + 92 x2 + 55 x — 4 = 0.