Find the product -3y (xy+y2) and find its value for x = 4 and y = 5
- 3y (xy + y2)
= - 3xy2 – 3y3
According to question:
When x = 4 and y = 5
= - 3 (4) (5)2 – 3 (5)3
= - 300 – 375
= - 675