For this case we have the following polynomials:
[tex]f (x) = 21x ^ 2 + 13x - 20
g (x) = -3x - 4[/tex]
To divide the polynomials we must follow the following steps:
1) Same base, the exponents are added.
2) Only terms that have the same exponent can be added or subtracted.
3) If the remainder is zero, the division is exact.
Answer:
[tex]f (x) / g (x) = -7x + 5
[/tex]
Note: see attached image for the solution.