8r²-48rs+70s²
Factorise by splitting middle term
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8r2-20rs-28rs+70s2
4r(2r-5s)-14s(2r-5s)
(4r-14s )(2r-5s)
4r(2r-5s)-14s(2r-5s)
(4r-14s )(2r-5s)
Noice
As promised
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