Question

F(x)=4x^3+7x^2+8x and g(x)=7x^2-7x, find (f-g)(x) and (f-g)(0)

Answer 1

(f-g)x is the same as f(x)-g(x)

(f-g)x= 4x^3+7x^2+8x-(7x^2-7x)

= 4x^3+7x^2-7x^2+8x+7x

=4x^3+0+15

=4x^3+15

(f-g)0= 4(0)^3+15

=0+15

=15