Question

The sum of the squares of three numbers is 105 while the sum of their products taken two at a time is 74.Their sum??

Answer 1

a sq + b sq + c sq= 105

ab=bc, a=c

ba=ac, b=c

means, a=b=c

so lets a, b , c be x

x sq + x sq + x sq= 3x sq

3 xsq=105

x sq=105/3

x= root under 35