请根据图中提供的信息，回答下列问题：
Do you know about the U．K.? London is the capital city. Its flag is red, white and blue.They speak English. Big Ben is very famous. Kings and queens live in palaces. I have an uncle. He lives in London.He says, "London is clean and beautiful."He is a teacher. He works from Monday to Friday.On Saturdays and Sundays, he likes to play football and go for a walk. I want to go to the U．K. Because I want to see Buckingham Palace.
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用直接开平方法解方程 ，方程的根为（ ）
，方程的根为（ ）