2xy • (5x 4y) solve

not sure what problem is:

if 2xy(5x*4y) then....= 20(x^2)(y^2)

if 2xy(5x-4y) then...=10(x^2)y - 10x(y^2)

if 2xy(5x+4y) then...=10(x^2)y + 10x(y^2)

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