Question

-20a elevada a 2 +a+1=0 pfv

Answer 1

-20a² +a +1 = 0 ===> *(-1)

20a² -a -1 = 0

∆=b²-4ac=1+80=81 => √∆=9

x = -b±√∆/2a

x = 1±9/2.20

x' =1+9/20 = 10/20 = 1/2 ✓

x" =1-9/20 = -8/20 = -2/5 ✓