Graph the functions ,f (x) = x^2, g (x) = x^2+7 and h (x) = x^2-7 on the same rectangular coordinate system.Then describe what effect adding a constant,k,to the function has on the vertex of the basic parabola.

for k>0

1-if we have p(x) = x^2+k 

1the vetex moves _____ units

2-if we have p(x) = x^2-k

the vertex moves ___ units