Question

o valor de. x2-x-2=0

Answer 1

x²-x-2=0

Fazemos por Baskhara.

x= -b± raiz b²-4ac/2a

x=-(-1)±raiz (-1)²-4.(1).(-2)/2.(1)

x= 1±raiz 1+8/2

x= 1±raiz 9/2
x= 1±3\2

X1=1+3/2» 4/2=2 X1=2

X2=1-3/2» - 2/2=-1 X2=-1

Logo: X1=2
E X2=-1