Question

Efectuati calculele :
a) (x+2$\sqrt{2}$)(x-2$\sqrt{2}$)
b)($\sqrt{2}$+3)²

Answer 1

a) (x+2√2)(x-2√2) = x²-8
am aplicat formula (a+b)(a-b)=a²-b²

b)(√2+3)² =2+6√2+9=11+6√2
am aplicat formula (a+b)²=a²+2ab+b²