Well, the way you wrote it, you would have:
(4x - 5y - 3) x 3x + 5y
which would give
12x^2 - 15xy - 9x + 5y
But, if you meant the quantity (3x + 5y), then you would have:
(4x - 5y - 3) x (3x + 5y)
which would give
12x^2 - 15xy - 9x + 20xy - 25y^2 - 15y
and combining terms
12x^2 - 25y^2 + 5xy - 9x - 15y
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The Abelian property or commutativity.
3x+5y+8x+2y combine 3x and 8x to get 11x 11x+5y+2y combine 5y and 2y 11x+7y is the answer.
It is: 7x+10y
x=(-5y-1)/3
no