Помогите номера 91,92!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

91√(x²-4x+4)+√(x²-8x+16)=√(x-2)²+√(x-4)²=|x-2|+|x-4|==|√7-2|+|√7-4|=√7-2+4-√7=292√(x²-14x+49_+√(x²-22x+121)=√(x-7)²+√(x-11)²=|x-7|+|x-11|==|√117-7|+|√117-11|=√117-7+11-√117=4