упростите выражение: а) √24 - 4√6 + √54 ;  б) 2k - (√k - √m)(√k + √m)

Приведите пожалуйста 2 аргумента и обоснование !!!! очень срочно после завтра пробник ))) 

ПРОШУ ПОМОЧЬ СРОЧНО!

1)Составте четыре предложения,в которых бы содержалась краткая характеристика исторических деятелей России. Употребите составное именное сказуемое со связкой БЫЛ  и существительным в иминительном или творительном падеже.

2)В учебнике по математике найдите 4 предложение , содержащее состаные именные сказуемые со всязко ЕСТЬ.

помоги с переводом

One afternoon, in a dark wood, little Red Riding Hood was on her way to her grandmother s house, carrying a basket of food. Suddenly, a wolf appeared and asked her where she was going. Little Red Riding Hood told hin and continued on her journey. The wolf disappeared into the forest. When the little girl opened the door of her grandmother s house, she noticed immediately that the wolf had got dressed up as the old lady. But Red Riding Hood was a clevel girl and was not taken in for a moment: the wolf had forgotten to put Grandmother s glasses on. While the wolf was lying in bed waiting to eat Red Riding Hood she dashed out of the house, locked the door, and called the police on her mobile phone. After a few minutes, the police turned up and arrested the wolf. "If only l hadn t forgotten to put on the glasses!" the wolf