Question

F(x) =2x+1 and g(x)=x²-7, find (f-g) (x)
help!! ​

Answer 1

(f-g)(x)=2x+1-x^2+7

=2x-x^2+8

=-(x^2-2x-8)

=-(x^2-4x+2x-8)

=-{x(x-4)+2(x-4)}

=-(x+2)(x-4)