For what value of k (4-k)x^2+(2k+4)x+(8k+1)=0 is a perfect square?

sir 7th class ke baad kisi karan se study chotni padi to kya ab 10th class me admission ho skta hai . Bs 7th class ki hi marksheet hai. Age:- 16 year Agr ho skta hai to kb krwa skte hai Please Reply

My son could not take admission in 11th class after 10th due to health reasons but he wants to study and does not want to waste his one year. So can we take direct admission to 12th for Oct 2020 ...