T ugaa kelompok mtk soal 2
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Transcript of T ugaa kelompok mtk soal 2
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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
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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
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3. b). X2 + 8x -20 = 0
Cara : a = 1
b = 8
c= -20
X1 =
= 4/2 =2
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= -10
C. X2 + 3x = 0
Cara : a = 1
b = 3
c = 0
X1 =
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= 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=