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(5k-5)(4k-5) foil and distributive
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(5k-5)(4k-5) foil and distributive

User Claytog
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(a+b)(c+d)=ab+ad+bc+bd
(5k-4)(4k-5)=20k^2+-25k-16k+20=20k^2-41k+20

Hope this helps!
User Manaclan
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