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2. (x+5)(5x-1) = 5xkuadrat - x + 25x - 5
= 5xkuadrat + 24x - 5
3. (7-20x)(2x-7) = 14x - 49 - 40xkuadrat+ 140x
= 154x - 40xkuadrat - 49
4. (2x-1)(1-x) = 2x - 2xkuadrat - 1+ x
= 3x - 2xkuadrat -1
5. maaf, kurang paham sama maksud soalnyaa.