3m × (2m^2 – 5mn + 4n^2) is equal to

3m × (2m² – 5mn + 4n²) is equal to
(a) 6m³ + 15m²n – 12mn²
(b) 6m³ – 15m²n + 12mn²
(c) 6m³ – 15m²n – 12mn²
(d) 6m³ + 15m²n + 12mn²

Solution:

Volume of a rectangular box whose adjacent edges are 3x²y, 4y²z and 5z²x respectively is
(a) 60xyz
(b) 60x²y²z²
(c) 60x³y³z³
(d) none of these

Solution:

(x – 1) (x + 2) is equal to
(a) 2x + 3
(b) x² + 2x + 2
(c) x² + 3x + 2
(d) x² + 2x + 3

Solution:

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