Question

Multiply:

(i) 3ab², -2a²b³

(ii) 4xy, 5y²x, (-x²)

(iii) 2m, -5n, -3p

Answer 1

(i) (3ab²) × (-2a²b²) 

= (+) × (-) × (3 × 2) × (a × a²) × (b² × b³) 

= -6a³ b⁵

(ii) (4xy) × (5y²x) × (-x²)

= (+) × (+) × (-) × (4 × 5 × 1) × (x × x × x²) × (y × y²)

= -20x⁴y³

(iii) (2m) × (-5n) × (-3p) 

= (+) × (-) × (-) × (2 × 5 × 3) × m × n × p

= + 30mnp 

= 30 mnp