Question

URGENTEEE

Resolva a equação x^{2} -2x-8=0

Answer 1

usa Delta e Baskara
Chamarei delta de D

D=b^2-4*a*c
D= (-2)^2-4*2*(-8)
D=4+64
D=68

x= (2+-√68)/2
x=(2+-2√17)/2

x'= (2+2√17)/2 =1+√17
x''= (2-2√17)/2=1-√17

Answer 2

x^{2} -2x-8=0
a = 1
b= -2
c = -8
delta = b^2 -4.a.c
delta= (-2)^2 -4.1.(-8)
delta= 4 + 32
delta = 36

x = (-b +- raiz de delta) /2.a
x = (- -2 +- raiz de 36) / 2.1
x = (2 +- 6) / 2
x'= ( 2+6) /2
x'= 8/2
x' = 4
x" = (2-6)/2
x"= (-4)/2
x"= -2