Question 53433
{{{y=sqrt(x)}}} and {{{y=-sqrt(x)}}}
Look the same only {{{y=-sqrt(x)}}} is upside down.
Plot a few points:
In {{{y=sqrt(x)}}}
{{{y=sqrt(0)=0}}} Plot(0,0)
{{{y=sqrt(4)=2}}} Plot(4,2)
{{{y=sqrt(9)=3}}} Plot(9,3)
Connect the dots and you have a graph:
{{{graph(300,200,-10,10,-10,10,sqrt(x))}}}
In {{{y=-sqrt(x)}}}
{{{y=-sqrt(0)=0}}} Plot(0,0)
{{{y=-sqrt(4)=-2}}} Plot(4,-2)
{{{y=-sqrt(9)=-3}}} Plot(9,-3)
Connect the dots and you have a graph:
{{{graph(300,200,-10,10,-10,10,-sqrt(x))}}}
Together you have:
{{{graph(300,200,-10,10,-10,10,sqrt(x),-sqrt(x))}}}
That happens with all functions.
{{{y=-x^2}}} looks like {{{y=x^2}}} See:
{{{graph(300,200,-10,10,-10,10,x^2,-x^2)}}}
Happy Calculating!!!