exam Maths Puzzle Numerical Ability

ln(x+4)-ln(x+1)=lnx

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I kind of understand how to solve these, but Im lost with this square root and fraction. The problem is:

For {{{ f(x)=sqrt( x+2 ) }}} and {{{ g(x)=(1)/x }}}, find f+g, f-g, f*g, Find the standard form of the equation of the line with slope = undefined, passing through the point(-8,3)