Question

Cum se rezolva ? $<var> x^2+4x^2 =( 3\sqrt5)^2</var>$

Answer 1

5x^2=(3sqrt(5))^2
5x^2=9*5
x^2=9 => x=-3 si 3

Answer 2

5x^2 = 45 => x^ = 9 => x= 3 sau x= -3