2+2
<span> ↑
</span>That is an expression. Make sure you don't put the "=" sign since it would become an EQUATION if you did.
In order to get g(x) you would multiply the equation of f(x) by -1/2.
4x(-1/2)=-2x and -2(-1/2)=1.
Given data:
The given equationn of the circle is (x + 1)^2 + (y - 5)^2 = 16.
The standard equation of the circle is,

The given equation can eb written as,

Compare the above equation with standard equation.

Thus, the coordinate of centre is (-1, 5) and radius is 4.