Question

if a=square root 5 - square root 2 upon square root 5 + square root 2 and b = square root 5 - square root 2 upon square root 5 + square root 2 find A square + B square -5ab

Answer 1

is it 2 √10-7 ,
I mean the final answer

Answer 2

2
$\sqrt{10} \times 7$