Question

Fill in the blank

$\begin{array}{ccc}7& 4& 121\\ 5& 8& 169\\ 8& 6& ....\end{array}$

Answer 1

The third number in each row is the square of the sum of the first two numbers.
Formula : $(a+b{)}^2=c$
$7+4=11;$ ${11}^2=121$
$5+8=13;$ ${13}^2=169$
$8+6=14;$ ${14}^2=196$