pepe y marff

1.-Factoriza las siguientes ecuaciones de 2 grados por el método de ensayo y error o completando cuadraros
(1) x^2 - 4x + 49 = 0
(x - _) (x - _)
(2) x^2 – 12x + 35 = 0
(x - 5) (x – 7)
(3) x^2+ 2x -48 = 0
(x – 6) (x + 8)
(4) x^2 - 13x + 40 = 0
(x – 5) (x – 8)
(5) x^2 + 20x + 48 = 0
(x + _) (X + _)
(6) x^2 – 6x – 7 = 0
(x + 7) (x – 1)
(7) x^2 – 12x + 32= 0
(x – 4) (x – 8)
(8) x^2– 7x + 30 = 0
(x - _) (x - _)
(9) x^2 + 9x + 20 = 0
(x + 4) (x + 5)
(10) x^2 + 5x – 24 = 0
(x + 8) (x - 3)
2.- Resuelve las ecuaciones utilizando la formula general para poder determinar eldiscriminante
(11) 5x^2 + 3x – 4 = 0
a= 5
b=3
c=-4



X1= 6.4339 X1= -12.4339
10 10
X1= o.64339 X1= - 1.24339

(12) 5x^2 + 6x + 9 = 0
a= 5b= 6
c= 9


X1=-6+12 X2= -6 -12
10 10
X1= 6 X2= -18
10 10
X1=0.6 X2= -1.8

(13) 3x^2 + 4x - 1=0
a=3
b=4
c=-1



X1= -4+5.2915X2= -4 -5.2915
6 6
X1= 1.2915 X2= -9.2915
6 6
X1=0.21525 X2= -1.5485

(14) 4x^2 - 5x – 12=0
a= 4
b= -5
c= -12


X1= 5 + 14.73 X2= 5 – 14.73
88
X1=19.73 X2= -9.73
8 8
X1=2.46625 X2= -1.21625

(15) 3x^2 + 5x - 2=0
a=3
b=5
c= -2


X1= -5+7 X2= - 5 - 7
6 6
X1= 2 X2= -12
6 6
X1=0.33X2= -2

(16) 2x^2 – 3x – 2=0
a=2
b=3
c= -2


X1= -3 + 5 X2= - 3 -5
4 4
X1= 2 X2= -8
4 4
X1= 0.5 X2= -2

(17) 6x^2 + x – 2=0
a=6
b=1
c=-2


X1= -1 +7 X2= - 1 -7
12 12
X1= 6 X2= -8
12 12
X1= 0.5 X2= -0.66
(18) 3x^2 – 3x – 18=0
a= 3
b= -3
c= -18


X1= 3 + 15 X2= 3 - 156 6
X1= 18 X2= -12
6 6
X1= 3 X2= -2

(19) x^2 – 4x – 12=0
a= 1
b= 4
c= -12


X1= - 4 + 8 X2= - 4 - 8
2 2
X1= 4 X2= - 12
2 2
X1= 2...