Question

a) x2 + 9x + 8 = 0
C) x² – 2x + 4 = 0
e) x² – 5x + 6 = 0
g) x² +2x – 8 = 0
i) - x² + x + 12 = 0
b) 9
d) 3
f) x²
h)
;)​

Answer 1

Resposta:

a)x2+9x+8=0

x=(-9+-√81-4.1.8)/2

x=(-9+-√81-32)/2

x=(-9+-√49)/2

x=(-9+-7)/2

x=(-9+7)/2

x= -2/2

x==-1

x=(-9-7)/2

x=-16/2

x= -8

x=-1. ou. x=-8

Explicação passo-a-passo:

C)x2-2x+4=0

x=(2+-√4-4.1.4)/2

x=(2+-√4-16)/2

x=(2+-√-12)/2 não pertence a R

e)x2-5x+6=0

x=(5+-√25-4.1.6)/2

x=(5+-√25-24)/2

x=( 5+-1)/2

x=(5+1)/2

x=6/2

x=3

x=(5-1)

x=4/2

x= 2

x=3 ou. x= 2

g)x2+2x-8=0

x=(-2+-√4-4.1.-8)/2

x=(-2+-√36)/2

x=(-2+-6)/2

x=(-2+6)/2

x=(-2+6)/2

x=4/2

x=2

x=(-2-6)/2

x= -8/2

x=-4

x= 2 ou x= -4

i)-x2+x+12=0

x2-x-12=0

x=(1+-√1-4.1.-12)/2

x=(1+-√49)/2

x=(1+-7)/2

x=(1+7)/2

x=8/2

x=4

x=(1-7)/2

x=-6/2

x=-3

x=4 ou x=-3