(i) x² – 3x – 40 = 0 => x² – 8x + 5x – 40 = 0 => x (x – 8) + 5(x – 8) = 0 => (x – 8) (x + 5) = 0 => x = 8, -5 (ii) y² + 11y + 30 = 0 => y² + 6y + 5y + 30 = 0 => y (y + 6) + 5 (y + 6) =0 => (y + 5) (y + 6) =0 => y = -6, – 5 Hence, x ≥ y.
1.55 + 2.05 + 1.5 × 11 – 20% of 10.5 = ?
Solve.
15.73 +13.25 +16.73 – 28.71 = 5 ×?
√ [? x 11 + (√ 1296)] = 16
22 – 15 + 20 × 18 ÷ 6 – 34 = ?
[{(3 × 54 × 21)/63} + 6] / 6 = √?
44% of 560 + 68% of 2160 × 5/12 =? + 32% of 920.
116 x (2/3)% of 420 + 666 x (2/3)% of 186 = 457 x (1/7)% of 126 + 555 x (5/9)% of 198 + ?
√(24²+285-8²-172) = ?²
? % of 1200 = 20% of 30% of 3600
