Question 172941
<.pre><font size=4><b>
{{{y = x^2 + 4x - 1}}}
Continue solving the eqn by Pyth Theorem:
where----->{{{system(a=1,b=4c=-1)}}}
Then, 
{{{x=(-b+-sqrt(b^2-4ac))/2a}}}
{{{x=(-4+-sqrt(4^2-4*1*-1))/(2*1)}}}
{{{x=(-4+-sqrt(16+4))/2=(-4+-sqrt(20))/2=(-4+-4.472136)/2}}}
So--->{{{system(x=(-4+4.472136)/2=highlight(0.236068),x=(-4-4.472136)/2=highlight(-4.236068))}}}
We see the graph:
{{{drawing(300,300,-6,6,-6,6,grid(1),graph(300,300,-6,6,-6,6,x^2+4x-1),circle(-4.236068,0,.15),circle(0.236068,0,.15))}}}
Thank you,
Jojo</pre>