Помогите решить квадратное уравнение - 4(4х-21)^2-7(4х-21)+3=0
Найти х1 и х2

Разгадайте кроссворд
1) The distance from the bottom to the top of something.2) You use it for biting and chewing.3) A type of plant with round underground stems which isused as a vegetable.4) A kind of racket sport for two of four players.5) Something with music or without it and people’s voice.6) A fruit consisting of a single seed in a hard shell.7) A small river or a brook.Задание