Answer:

a= 2 ; b= -6 ; c= -20

x= -(-6) ± √(-6)² - 4(2)(-20) / 2(2)

x= 6 ± √36 + 160 / 4

x= 6 ± √ 196 / 4

x= 6 ± 14 / 4

x1= 6 + 14 / 4

x1= 20 / 4

x1= 5

x2= 6 - 14 / 4

x2= -8 / 4

x2= -2