Question

prosze o pomoc;)

Answer 1

x=3+2√7

y=5-3√7

 

1

x+y = 3+2√7+5-3√7 = 8-√7

 

2

x-y = 3+2√7 -(5-3√7) = -2+5√7

3

xy = (3+2√7)(5-3√7) = 15-9√7+10√7-42 = -37+√7

4

x² = (3+2√7)² = 9+12√7+28 = 37+12√7

5

x/y = (3+2√7)/(5-3√7) = (3+2√7)*(5+3√7)/(5-3√7)*(5+3√7) = (15+9√7+10√7+42)/25-63

(57+19√7)/-38 = 19(3+√7)-38 = -(3+√7)/2

 

6

y² = (5-3√7)² = 25-30√7+63 = 88-30√7