Use the remainder theorem: we can decompose the given polynomial in terms of quotient and remainder polynomials
and
, respectively, such that

Then letting x = -3 makes the quotient term vanish, and we're left with a remainder of

-7p^5 + 5q + 5p^5
-2p^5 + 5q
Answer:
Step-by-step explanation:
f(x)=4x+1
g(x) = x^2-5
(f*g)(x) = 4x^3+x^2-20x-5
3x + 12 = 3
(multiply 3 by the variables in the parentheses)
3x + 12 = 3
add 12 to each side
3x = 15
divide each side by 3
X=5