1,She(come)Is going to come to her grandfather's house in the countryside next week.
2,We(go)Are going to go camping this weekend.
3,I(have)Are going to have my hair cut tomorrow because it's too long.
4,She(buy)Is going to buy a new house next month because she has had enough money.
5,Our grandparents (visit)Are going to visit our house tomorrow. They have just informed us.

\(\Leftrightarrow x-\sqrt{x}-12=0\)

\(\Leftrightarrow x=16\)