中四幾條數(英文)

有幾條數想請教下大家,請大家列埋式
1:p is the sum of three consecutive even numbers, 2(n+2)-2,2(n+2) and 2(n+2)+2,n is a non-negative integer; Q is the sum of three consecutive integers n+1,n+2 and n+3.Indicate whether the value of each of the following square roots is a rational number or not.
問題:根號(P除Q)

2.simplify each of the following
根號-5 +根號-20 －根號-45

3.If 2i is a solution of the equation x^4+3x^2+a=0,find the value of a.
就係咁多,請大家解答一下THX!!