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Jawaban no 6 - 10
6. ( x + 4 ) ( x + 2 )
X1 = -4
x2 = -2

7. ( x + 2) ( x - 8 )
x1 = -2
x2 = 8

8. ( x - 8 ) ( x - 6 )
x1. = 8
x2 = 6

9. ( x + 6 ) ( x + 6 )
x1 dan x2 = -6

10. ( x - 7 ) ( x - 7)
x1 dan x2 = 7

Penyelesaian:

1. x² + 4x = 0
= x (x + 4) = 0
x = 0 v x = -4

2. 4x² - 36x = 0 :4
x² - 9x = 0
x (x - 9) = 0
x = 0 v = 9

3. x² - 81 = 0
(x + 9)(x - 9) = 0
x = -9 v x = 9

4. x² = 121
x = 121^1/2
x = 11

5. 36x² - 9 = 0 : 4
4x² - 1 =0
4x² = 1
x² = 1/4
x = 1/2

6. x² + 6x + 8 = 0
(x + 4)(x + 2) 
x = -4 v x = -2

7. x² - 6x - 16 = 0
(x - 8)(x + 2) = 0 
x = 8 v x = -2

8. x² - 14x + 48 = 0
(x - 8)(x - 6) = 0
x = 8 v x = 6

9. x² + 12x + 36 = 0
(x + 6)(x + 6) 
x = -6

10. x² - 14x + 49 = 0
(x - 7)(x - 7) = 0
x = 7