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-5 ) = 0

X = 0 – 10 X = 0 + 5

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

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 = c

bb

2

2

1

2

1

= -2

1 (-14) + 2

)14(2

1 -(12)

= 2

14 + )12()7( 2

= 7 + 1249

= 7 + 37 = 7 + 6,08 = 7 + 6,08 = 13,08

X2= -2

1 b - c

b

2

2

1

=-2

1 (-14) - )12(2

)14(2

1

= )12()7(2

14 2

= 7+ 1249

= 7+ 37 = 7 – 6,08

= 7 – 6,08 = 0,92

3. b). X2 + 8x -20 = 0

Cara : a = 1

b = 8

c= -20

X1 =

= 4/2 =2

= -10

C. X2 + 3x = 0

Cara : a = 1

b = 3

c = 0

X1 =

= 0

X2 = -b - acb 42

= )0)(1()3( 2

=09

= 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=