Question

Se consideră expresia ​

Answer 1

a. E(x)=x²-2x+1+x²+4x+4+18-2x²

E(x)=2x+23

b. E(√8)=4√2+23

E(√2)=2√2+23

E(√18)=6√2+23

4√2+23-(2√2+23)=6√2+23-(4√2+23)

4√2+23-2√2-23=6√2+23-4√2-23

2√2=2√2 Adevarat