F.4 Function

If f(x) =-x^2+4x-2 and g(x)=2x+1,find the value of
g(3)-2f(0)


If H(x)=ax-5 and H(5)=10,find the value of a .

If F(x)=2x-1,find
(a)F(2k)
(b)F(3-k)

It is given that f(x)=4(x+k),g(x)=kx and f(3)=2g(1)
(a)Find the values of k.
(b)Hence,find the values of x such that f(x)-g(x)=6