Question

Let ​f(x)= -4x-1 and ​g(x)= x^2+1.
Find ​(f x g)(7​).
(f x g)(7​) = __

Answer 1

Explanation:

Let ​f(x)= -4x-1 and ​

g(x)= x^2+1.

(f.g)(x) = (-4x-1)(x²+1)

-4x(x²+1)-1(x²+1)

-4x³-4x-x²-1

​(f.g)(x​)= -4x³-x²-4x-1

​(f.g)(7​) =-4(7)³-(7)²-4(7)-1= -4(343)-49-28-1 = -1372-77-1= -1372-78 = -1450