1). (p - a)² - 9p + 9a = (p - a)² - 9(p - a) = (p - a)(p - a - 9);
2). (m - n)² - mk + kn = (m - n)² - k(m - n) = (m - n)(m - n - k);
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1). (p - a)² - 9p + 9a = (p - a)² - 9(p - a) = (p - a)(p - a - 9);
2). (m - n)² - mk + kn = (m - n)² - k(m - n) = (m - n)(m - n - k);
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