Question

1) Calculando as raízes da funçao y= -x²+3x+10 encontra se ?

Answer 1

y=-x^2+3x+10
a=-1
b=3
c=10
DELTA=b^2-4ac
DELTA=3^2-4.(-1).10
DELTA=9+40
DELTA=49
X=
-B +- raiz de delta
---------------------------
2a
-3+- raiz de 49
------------------
2. (-1)
X1=-3+7
-----
-2
X1=4
-----
-2
X1=2

X2=-3-7
-------
-2
X2=-10
-------
-2
X2= 5