Difference of squares worksheet - 2

Factor the following expressions with the help of difference of squares formula

`x^8 - y^8`
`(x + 5)^2/36 - (y - 5)^2/64`
`sqrt(x^2 - 1)`
`x^2/225 - y^2/100`
`a^4b^2 - b^4a^2`
`100x^2 - 324y^2`
`8x^2 - 72y^2`
`(x + 1)^2 - (y - 1)^2`
`(a^2 - b^2)^2 - (a^2 + b^2)^2`
`x^2/64 - 16y^2`

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