Question

Calculati: (√8+√5)*(√8-√5)

Answer 1

(Radical 8 + radical 5) * (radical 8 - radical 5)=
=(radical 8) ^ 2 - (radical 5) ^2
=8 - 5
=3

Obs: ^2 = la puterea 2
Se folosește formula:
(a-b)(a+b)=a^2 -b^2