Question

dada a funçao quadrática f(x)= x²-2x-3, determine o valor das raizes reais

Answer 1

a= 1 b=-2 c=-3
delta= (-2)²-4.1.(-3)
delta= 4 +12
delta=16

x=-(-2)+-raiz de 16/2.1
x=2+-4/2 
x1= 2+4/2= 6/2=3
x2= 2-4/2= -2/2=-1