Răspuns:
A
a) x²=9 => x=3
b) 7x²=63 => x²=9 => x=3
c) (x-1)²=4 => x-1 = 2 => x= 3
d( (2x+1)²=49 => 2x+1 = 7 => 2x = 6 => x= 3
B
a) x² = 4 => x €{-2,2}
b) 5x²= 20=> x² = 4 => x€{-2,2}
c) (x-1)²=9 => x-1 = 3 => x=4
d) (2x-1)²=25 => 2x-1=5 => 2x=6 => x=3
La c) si la d) nu stiu ce am gresit dar... sper sa fie bine si ca am fost de folos
