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The first number or the (2) will multiplied to the 3 number opposite to there group example:

(2x)×(5x)=10x to the second power(^2)

(2x)×(4y)=8xy

(2x)×(8)=16x

in organize form is

[10x^2) + 8xy + 16x]

and the next is the second number the number 3

(3y)×(5x)=15xy

(3y)×(4y)=12y to the second power(^2)

(3y)×(8)=24y

and in organize is

[12y^2) + 15xy + 24]

and the last one is the number 4

(4)×(5x)=20x

(4)×(4y)=16y

(4)×(8)=24

and in organize is

[20x + 24y + 16]

Then the last is to add all the same equation and the answer is

=10x^2 + 12y^2 + 23xy + 36x + 40y + 24

I hope it help you