Question 898250
Positive solution:
{{{x^2-8x=16}}}
{{{x^2-8x+16=16+16}}}
{{{(x-4)^2=32}}}
{{{x-4=0 +- sqrt(32)}}}
{{{x=4 +- 4sqrt(2)}}}
Negative solution:
{{{-(x^2-8x)=16}}}
{{{x^2-8x=-16}}}
{{{x^2-8x+16=0}}}
{{{(x-4)^2=0}}}
{{{x-4=0}}}
{{{x=4}}}
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{{{drawing(300,300,-8,12,-4,20,circle(4,16,0.3),circle(4+4*sqrt(2),16,0.3),
circle(4-4*sqrt(2),16,0.3),graph(300,300,-8,12,-4,20,abs(x^2-8x),16))}}}