it would be a or distributive property
steps:first identity properly is pretty much the product of any number and 1 equals that number so you can cross that off because it doesn’t apply. second is commutative which is changing the order of factors doesn’t change the solution which doesn’t apply and it’s distributive because with the -15x(-3x+2) that’s the same thing as -15x times -3x+-15x times 2
