factorise the following expression
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→p²-22p+21
→p²-(21+1)p+21
→p²-21p-p+21
→p(p-21)-1(p-21)
→(p-1)(p-21).
→p²-(21+1)p+21
→p²-21p-p+21
→p(p-21)-1(p-21)
→(p-1)(p-21).
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