Question

ajutorrrr va rog!!! ​

Answer 1

Explicație pas cu pas:

a=-3V5=>a=-V45

b=-2V11=>b=-V44

=> b>a

E(x)=2(x+2)²-(x+3)(x+5)+8=>

E(x)=2(x²+4x+4)-(x²+8x+15)+8=>

E(x)=2x²+8x+8-x²-8x-15+8 =>

E(x)=x²+1

E(a)-p.p => a²+1-p.p => a²+1=k² => a²-k² = -1 =>

(a-k)(a+k)=-1

Doar daca:

a-k=1

a+k=-1

=>2a=0=>a=0