Question

Resolva as Equações abaixo

(OBS:E EQUAÇÃO 2 GRAU,Delta)

A)X2-6X+8=0
B)X2-X-2=0
C)X2-9X+20=0
D)X2-8X+16=0
E)X2-2X+1=0
F)X2+8X+7=0
G)X2-4X+3=0
H)X2+X-12=0

Answer 1

A) x²-6x+8=0
Delta =(-6)²_4.1.8
D=36-36
D=0
x1,2 = - b ± raiz de delta/2.a
X1=-(-6)+0/2=3
X2= - (-6)_0/2=3
B) x²-x-2=0
D=(-1)²-4.1.(-2)
D=1+8 =9
X1,2 = - (-1)±3/2.1
X1=2
X2=-1
C) X²-9X+20=0
Delta =(-9)²-4.1.20
D=81-80 =1
X1,2 =-(-9)±1/2.1
X1=5
X2 =4
D) X²-8X+16=0
D= (-8)²-4.1.16
D= 64-64
D=0
X1,2 =-(-8)±0/2.1
X1=8/2=4
X2= 4
E)X²-2X+1=0
D= (-2)²-4.1.1
D=4-4 =0
X1,2 = - (-2)±0/2.1
X1= 2/2=1
X2= 1
F) X²+8X+7=0
D= 8²-4.1.7
D= 64-48 =16
X1,2 =-8±4/2.1
X1=-4/2 = - 2
X2 = - 12/2= - 6