Question

Tentukan himpunan penyelesaian
1.X² -7x-18=0
2.X²-25=0
3.2X²-6X=0
4.5X²-17X+6+0
512X² +X-1=0

Answer 1

1. x² - 7x - 18 = 0
(x + 2)(x - 9) = 0
x = - 2 atau x = 9

2. x² - 25 = 0
(x + 5)(x - 5) = 0
x = - 5 atau x = 5

3. 2x² - 6x = 0
2x(x - 3) = 0
x = 0 atau x = 3

4. 5x² - 17x + 6 = 0
(5x - 2)(x - 3) = 0
x = 2/5 atau x = 3

5. 12x² + x - 1 = 0
(4x - 1)(3x + 1) = 0
x = 1/4 atau x = - 1/3

Answer 2

1. (x+2)(x-9) = 0 
x= -2 atau x = 9

2. (x-5)(x+5) = 0 
x= 5 atau x= -5

3. 2x(x-3) = 0 
x = 0 atau x = 3

4. (5x-2)(x-3) = 0 
x = 2/5 atau x= 3

5. (4x-1)(3x+1) = 0 
x= 1/4 atau x= -1/3