Question

Ex 44 va rog !
Ofer coroana

Answer 1

Răspuns:

x²-9=0 | +9

x²=9 => x=√9= 3

4x²-25=0 | +25

4x²=25 | :4

x²= 25/4

x= √25/√4 => x= 5/2

x²-5x=0

x(x-5)=0 | => x=0 ; x=5 (X are doua valori)

3x²+5x=0

x(3x+5)=0 | => x=0 ; 3x+5=0 ( x are doua valori)

3x= -5 l :3

x= -5/3