Question

Daca $x^{2}$ = 1400.Aflati x=?

Answer 1

x² =1400
x²= 10² ×14
x=√10² ×14
x= +/ - 10√14

Answer 2

Orice ecuatie de forma:
$x^{2} =a, a>0$
Are ca solutie: 
$x_{1} =- \sqrt{a}$,
respectiv: $x_{2} = \sqrt{a}$
Pentru ecuatia considerata avem ca:
$\sqrt{1400} = \sqrt{14*100} = \sqrt{100} * \sqrt{14}$
Asadar, solutiile ecuatiei: $x^{2} =1400$ sunt:
$x_{1} =-10 \sqrt{14}$,
respectiv: $x_{2} =10 \sqrt{14}$