Question

(X√2 + 1)la patrat - (x√2+1)(x√2-1)-2x√2 ....repedee

Answer 1

$...=2x^2+2x\sqrt2+1-2x^2+1-2x\sqrt2=2$

Am folosit formulele:

$(a+b)^2=a^2+2ab+b^2\ \ si \ \ (a-b)(a+b)=a^2-b^2$

Answer 2

2x patrat + 2xradical din 2 + 1 - 2x patrat + 1 -- 2x radical din 2 =2