Question

find the product -3y(xy + y ²) and find its value when x =4 and y =5​

Answer 1

-3y(xy + y^2)

= (-3y)(xy) - (3y)(y^2)

= -3xy^2 - 3y^3

Thus, -3y(xy+y^2) = -3xy^2 - 3y^3

Now, put x = 4 and y = 5

=> -3(4)(5)^2 - 3(5)^3

=> (-3)(4)(25) - (3)(125)

=> - 300 - 375

=> -675

Answer 2

Answer:

-215

Step-by-step explanation:

-3*4(4*5+(5*5)

-12*20+25

-240+25

-215