Question 332029
Start with the graph of {{{y=x^2}}}


{{{ drawing(500, 500, -10, 10, -10, 10,
 graph( 500, 500, -10, 10, -10, 10,x^2)

)}}}


Now move it down 3 units to graph {{{y=x^2-3}}} (new graph shown in green)


{{{ drawing(500, 500, -10, 10, -10, 10,
 graph( 500, 500, -10, 10, -10, 10,x^2,x^2-3)

)}}}


So the graph of {{{y=x^2-3}}} is 


{{{ drawing(500, 500, -10, 10, -10, 10,
 graph( 500, 500, -10, 10, -10, 10,x^2-3)

)}}}