Question

Resolva a equação -x²+8x+9=o pfvr ajuda!!

Answer 1

a= -1
b= 8
c= 9

delta = 8^2-4(-1)(9)
delta = 64+36
delta = 100

X = -8+/- √100
-----------------
2(-1)


X1= -8+10
-----------
-2

X1= 2
------
-2

X1= -1


X2 = -8-10
---------
-2

X2= -18
--------
-2

X2= 9

S = {-1, 9}

Answer 2

-×ao quadrado +8xao quadrado +9=