if you could get the answer with a short explanation that would be great!

Answer:
3x + 1
Step-by-step explanation:
3x + 1
x - 5 I 3x² - 14x - 5 3x²÷x = 3x; (x-5)*3x = 3x² - 15x
3x² - 15x Subtract
- +
0 + x - 5 x ÷x = 1 ; (x -5)*1 = x - 5
x - 5 Subtract
- +
0