3x = 15
x = 5
Himpunan penyelesaian: {5}
2) 15x2 – 8x – 20 = 1
Pembahasan:
15x2 – 8x – 20 = 1
15x2 – 8x – 20 = 150
x2 – 8x – 20 = 0
(x – 10) (x + 2) = 0
x = 10, x = -2
3x = 15
x = 5
Himpunan penyelesaian: {5}
2) 15x2 – 8x – 20 = 1
Pembahasan:
15x2 – 8x – 20 = 1
15x2 – 8x – 20 = 150
x2 – 8x – 20 = 0
(x – 10) (x + 2) = 0
x = 10, x = -2
Editor: Muhammad Khusaini