Question

ajutatima va rog. dau coroana ex 14

Answer 1

 Ex 14

(a+1/a)²=4²=16
a²+2 * a*1/a+1/a²=16
a²+1/a²+2=16
a²+1/a²=16-2=14

(a²+1/a²)²=14²=196
a^4 +1/a^4 +2*a²*1/a²=196
a^4+1/a^4+2=196
a^4+1/a^4=196-2=194

Extra ex 13
a) (-a-b)²= [(-1)(a+b)]²= *(-1)² (a+b)²=(a+b)² deci A
b) cf pct a . a-b= -(b-a) si deci (a-b)²= (b-a)²
 atunci relatia este  ( !!! capcana!!)  falsa pt oricare a≠b si adevarata pt a=b

acum am vazut ca pe 13 nu il vroiai deci ma o[presc