(r^2-t^2)(r^2+t^2)

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We use FOIL to solve this: (First, Outer, Inner, Last)

First: r² times r² which gives us r^4

Outer: r² times -t² which gives us -r²t²

Inner: t² times r² which gives us r²t²

Last: t² times -t² which gives us -t^4

We combine like terms and see that the middle two terms (outer and inner) cancel out. We get

r^4 - t^4

Hope that helps.

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