2. 1A.X2+5x-50=0
Jwb : X2- 5x +10x-50= 0
(x2-5) + (10x-50) = 0
X (x -5 ) + 10 (x-50) = 0
(x+10) (x-50) = 0
( x +10 ) = 0
X
= 0 – 10
B. X2 + 3x = 0
X(x+3)=0
C. X2 – 2x + 2x -4 = 0
X2-2x+2x-4 = 0
X (x-2) + 2 ( x-2)
(x+2) (x-2)
D.2x2+3x+1 = 0
2x2+2x+1x+1 =0
2x (x+1) (x+1)
2+x) (2+1)
E.3x2+5x-2 = 0
( x-5 ) = 0
X =0+5

3. 3x2-1x+6x-2 = 0
(3x2-1x) + (6x – 2 )= 0
X (3x-1) + 2 (3x-1) = 0
(x+2) (3x-1) = 0
2. a. X2 + 5x + 4 = 0
Cara: a = 1
B=5
C=4
X1 =
1
b
2
1
b
2
2 c
2
= - 1 (-14) + 1 ( 14)
2
2
= 14 + ( 7) 2 (12)
2
49 12
=7+
= 7 + 37
= 7 + 6,08
= 7 + 6,08 = 13,08
2 c
X2= - 1 b
2
-
1
b
2
2 (12 )
=- 1 (-14) - 1 ( 14)
2
2
= 14 ( 7) 2 (12)
2
= 7+ 49 12
= 7+ 37
= 7 – 6,08
= 7 – 6,08 = 0,92
-(12)

4. 3. b). X2 + 8x -20 = 0
Cara : a = 1
b=8
c= -20
X1 =
= 4/2 =2

5. = -10
C. X2 + 3x = 0
Cara : a = 1
b=3
c=0
X1 =

6. =0
X2 = -b -
b2
4ac
(3) 2 (1)(0)
=
=
=
=
9 0
9
=
= -3
4) (p+3) x2 + 3x -4 =0
Misal : p=0
(0+3) x2+3x-4=0
3x2+3x-4=0
(3x+2)(x-2)
3x+2=0
x-2=0
3x=-2
x =0
X=