Question 78517
{{{a^2+b^2=c^2}}}
{{{a^2+4^2=11^2}}}
{{{a^2+16=121}}}
*subtract 16 from both sides
{{{a^2=105}}}
**take the square root of both sides
{{{a=10.247}}}
***check:
{{{10.247^2+4^2=11^2}}}
{{{105+16=121}}}