Question

Buna! Ma puteti ajuta va rog? ​

Answer 1

Răspuns:

vezi rezolvarea in poză

Answer 2

$E(x)=\Big(x+\sqrt{2} \Big)^2+\Big(1-x\sqrt{2} \Big)^2+x(3-x)-2\\\\ E(x)=x^2+2\cdot x \cdot \sqrt{2} +\Big(\sqrt{2} \Big)^2+1^2-2\cdot1\cdot x\sqrt{2}+ \Big(x\sqrt{2} \Big)^2+3x-x^2-2\\\\ E(x)=x^2+2x\sqrt{2} +2+1-2x\sqrt{2} +2x^2+3x-x^2-2\\\\ E(x)=2x^2+3x+1\\\\ E(x)=2x^2+2x+x+1\\\\E(x)=2x(x+1)+1(x+1)\\\\E(x)=(x+1)(2x+1)$