Question

Equação de 2 grau(9° ano)

b)x²+2×=3


A)1
b)2
C)0

∆=b²-4.a.c
∆=(2)²-4.1.0
∆=4+0
∆=

X=-b±√∆
-------
2.a

X=-(2)±√4
-------
2.1


X=-2±2
-----
2

X=-2+2=0=0
--
2

X=-2-2=-4=-2
--
2

​

Answer 1

Resposta:

X = - (- 7) + - \sqrt{(- 7) ^{2} - 4 . 1 . 10}

(−7)

2

−4.1.10

/ 2 . 1 =

X = + 7 + - \sqrt{49 - 40} / 2 =

49−40

/2=

X = 7 + - \sqrt{9} / 2 =

9

/2=

X = 7 + - 3/2 =3/2=

X' = 7 + 3/2 = 10/2 = 5

X'' = 7 - 3/2 = 4/2 = 2

S = {5 , 2}