Answer :
Answer:
The correct option is C.
Step-by-step explanation:
Given:
f(x)=x²+3x-4 and g(x)=x+5
We have to find f(x) • g(x)
In this question simply multiply the functions:
(x²+3x-4) (x+5)
Multiply each element of 2nd bracket with the every element of first bracket.
= x(x²+3x-4)+5(x²+3x-4)
= x^3+3x^2-4x+5x^2+15x-20
Now solve the like terms:
= x^3+8x^2+11x-20
Thus the correct option is C....
Answer:
c) x^3 + 8x^2 + 11x - 20.
Step-by-step explanation:
f(x) . g(x) = (x + 5)(x^2 + 3x - 4)
= x(x^2 + 3x - 4) + 5(x^2 + 3x - 4)
= x^3 + 3x^2 - 4x + 5x^2 + 15x - 20 Simplifying like terms:
= x^3 + 8x^2 + 11x - 20.