Question

x²-x-20=0 FORMULA DE BHASKARA EQUACAO DE SEGUNDO GRAU MII AJUDE?????

Answer 1

^= b2 -4a.c
^= (-1)2 -4(1).(-20)
^= 1 +80 
^=81

-b-+/^ 
_____
2.a

Answer 2

x²-x-20 = 0
Δ = b²-4ac
Δ = (-1)² - 4.1.(-20)
Δ = 1+80
Δ = 81
x = (-b+/-\/Δ)/2a
x = (-(-1)+/-\/81)/2
x = (1+/-9)/2
x1 = (1+9)/2 --> x' = 10/2 --> x' = 5
x2 = (1-9)/2 --> x" = -8/2 --> x" = -4
S: {5;-4}