Verified answer

1) D= 4+32= 36

x1= (2+6)/2= 4

x2= (2-6)/2= -2

(x-4)(x+2)

2) D= 81+40= 121

x1= (9+11)/4= 5

x2= (9-11)/4= -0,5

(x-5)(x+0,5) или (x-5)(2x+1)

3) D= 25- 16= 9

x1= (-5+3)/8= -1/4= -0,25

x2= (-5-3)/8= -1

(x+0,25)(x+1) или (4x+1)(x+1)