Question 1020491
Pick any five x values and evaluate k for each of them and graph the points.  You will have a parabola opening upward, with vertex moved to (0,-6).


{{{graph(300,300,-7,7,-7,7,x^2-6)}}}
That is your first equation or function, k(x); not the second one or h(x).


h(x) is a top branch of a parabola, because square root function based.  Similar idea but {{{h(x)=sqrt(x-2)}}}.  The vertex will be  (2,0).