Question 869624
{{{c^2= 8.66^2+b^2}}}
{{{(2b)^2= 8.66^2+b^2}}}
{{{4b^2-b^2=8.66^2}}}
{{{3b^2=8.66^2}}}
{{{b^2=8.66^2/3}}}
{{{b= 0 +- 8.66/sqrt(3)}}}
{{{b= 0 +- (8.66/3)*sqrt(3)}}}
{{{b= 0 +- 4.99985)}}}
Rounding up,
{{{b=0 +- 5}}}