Use special products to expand and simplify: [(a+3)^2+(a+3)b+b^2][3+a-b] Show solution

You need
to use the special product `x^3 - y^3 = (x - y)(x^2 + xy +
y^2).`

You should substitute a+3 for x and b for y in product
`(x - y)(x^2 +...

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