Question

ajutor va rog ex 18 ​

Answer 1

Răspuns:

(1-√2)(1+√2)=1^2-√2^2 = 1-2=-1

(1-√2)^2=1-2√2+2=-1+2√2

(1+√2)^2=1+2√2+2=3+2√2

x=-1+(-1+2√2)+3+2√2

x= 2-1+2√2+2√2

x=1+4√2