Question

1- Resolva as equações do 2 grau: A-)3x²-9x+6=0

B-)3x²-8x-3=0
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Answer 1

Resolva as equações do 2 grau:
A-)
3x²-9x+6=0
a=3; b = -9; c=6
∆= b^2-4ac
∆= (-9)^2 - 4.3.6
∆= 81-12.6
∆= 81-72
∆=9
X =(-b+/- √∆)/2a
x = [-(-9)+/-√9]/2.3
x = (9+/- 3)/6

X'= (9-3)/6=6/6=1
X"= (9+3)/6=12/6= 2
________
B-)
3x²-8x-3=0
a=3; b= - 8; c = -3
∆= b^2-4ac
∆= (-8)^2-4.3.(-3)
∆= 64+12.3
∆= 100
X = (-b+/- √∆)/2a
X =[-(-8)+/-√100]/2.3
X =[8+/-10)/6

X'= (8+10)/6=18/6=3

X"= (8-10)/6= -2/6(:2)/(:2)
x"= -1/3