Question

PLEASE HEP FAST: For f(x)=2x+1 and g(x)=x^2-7 fins (f o g)(x)

A.)2x^2-13
B.)2x^3+x^2-14x-7
C.)3x^2+7x-6
D.)2x^3-x^2-7x-7

Answer 1

The correct answer is B.

Answer 2

`(2x + 1) * ( {x }^(2) - 7) \\ = 2x( {x}^(2) ) + 2x( - 7) + 1( {x}^(2) ) + 1( - 7) \\ = 2 {x}^(3) + ( - 14x) + {x}^(2) + ( - 7) \\ = 2 {x}^(3) - 14x + {x}^(2) - 7 \\ = 2 {x}^(3) + {x}^(2) - 14x - 7`
The answer is B.