Question

Calcular a raiz , formula de bhaskara
y= x²-2x-3

Answer 1

Bom tarde:
Pela forma de Bhaskara temos que
(-b+- raiz de b^2-4ac)/2a
(-(-2)+-raiz de 4-4. (1)(-3))/2 (1)
(2+-raiz de 16)/2
(2+-(4))/2
Quando for +》(2+4)/2=3
Quando for -》 (2-4)/2=-2/2=-1

Answer 2

y=x²-2x-3
delta=b²-4.a.c
delta=(-2)²-4.1.(-3)
delta=4+12
delta=16
x= -b+-raiz de delta
      -------------------
               2a
x= -(-2)+-raiz de16
       ---------------------
                2.1
x= 2+-4
    -------
       2

x'= 2+4
     ------ 
        2
x'= 6
    ---- = x'=3
      2

x"= 2-4
     -----
       2

x"= -2
     -----  = x"= -1
       2
S=(3,-1)