How to do the following math questions?

Question

1)Solve the equation. (Enter your answers from smallest to largest.)

3t^2 + 8t + 4 = 0

2)Simplify the expression and leave without radicals if possible. Assume all variables are positive.

√25x3z12

3)Simplify the expression and leave without radicals if possible. Assume all variables are positive.

(289L^(2 / 5)P)^(5 / 2)x(P)^ (– 5 / 2)

Answer 1

3t2 + 8t + 4 = 0

= 3t2 + 6t + 2t + 4  = 0

  -= 3t (t+2) + 2 (t + 2) = 0

        therefore, answer = (3t+ 2) (t+2) = 0

    if 3t + 2 = 0, then 3t = -2 and t= -2/3

   if t+ 2= 0 , then t = -2