Разложите, если возможно, на линейные множители многочлен: а) x^2–4x–21=0; б) 5x^2+13x+8=0; в) –4x^2+7x–3=0; г) 10x^2+9x–63=0; д) a^2+a–20=0; е) 7b^2–3b+1=0; ж) a^2–ab+6b^2=0; з) x^2+ax–30a^2=0; и) 3y^2–2by–5b^2=0; к) x^2–2xz–z^2=0; л) 2с^2+cd+4d^2=0; м) x^3–12x^2+20x=0.
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