exam Maths Puzzle Numerical Ability

I am having problem,s with this problem

Solve equations for X
x^2+4x+4=7

Thank a million for the help

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9. (10 pts)

In a survey of 75 consumers, 12 indicated that they were going to buy a new car, 18 said they were going to buy a new refrigerato need a system of equations for this prob: an airplane flew 4 hours against a wind of 40 km/h. on return he was flowing with the wind and flight was 3 hours. whats speed of airplane in still air.