Question

How do you factor `x^3y^2 + 729y^2`?

Answer 1

`x^3y^2+729y^2`

Extract the common factor `y^2`
`color(white)("XXXX")` `=y^2(x^3+9^3)`

Factor sum of cubes
`color(white)("XXXX")` `=y^3(x+9)(x^2-9x+81)`