Factorise:21x2y3 + 27x3y2

1.	Factorise:21x2y3 + 27x3y2
Answer» 21x²y³ + 27x³y² = 3 × 7 × x × x × y × y × y + 3 × 3 × 3 × x × x × x × y × y = 3 × x × x × y × y (7y + 9x) (Using ab + ac = a (b + c)) = 3x²y² (7y + 9x)

Answer»

21x²y³ + 27x³y²

= 3 × 7 × x × x × y × y × y + 3 × 3 × 3 × x × x × x × y × y

= 3 × x × x × y × y (7y + 9x) (Using ab + ac = a (b + c))

= 3x²y² (7y + 9x)

Discussion