[질문] 인수분해(엑스+5)(엑스-2)더하기(엑스+5)(2엑스+1)는몬가요식도부탁드립니다ㅜ

(x+5)(x-2)를전개하면x제곱+3x-10.(x+5)(2x+1)을전개하면2x제곱+11x+5.이두식을합하면3x제곱+14x-5가되어인수분해하면(3x-1)(x+5)가됩니다^^;