whats the answer to 3xy(2x^2+5xy-7y^2

To find the answer to the expression 3xy(2x^2+5xy-7y^2), we need to apply the distributive property of multiplication over addition/subtraction. Here's how you can expand the expression:

1. Start by multiplying each term inside the parentheses by 3xy:
3xy * 2x^2 = 6x^3y
3xy * 5xy = 15x^2y^2
3xy * -7y^2 = -21xy^3

2. Now, combine the expanded terms by adding or subtracting them:
6x^3y + 15x^2y^2 - 21xy^3

And that's the expanded form of the expression 3xy(2x^2+5xy-7y^2).

Your question is unclear.

3xy(2x^2+5xy-7y^2) = 6x^3y + 15x^2y^2 - 21xy^3

Is that the answer you are seeking?