Question

Square of (9) + square of (2) = square of (6) + ?

Answer 1

it means 81 + 4 = 85 ...........so''''' 85 = 36 + ?...............? = 85- 36 = 49     ..............# and we know that 49 is a square of 7 ..so 7 is the ans

Answer 2

the answer will be 7² (49)............
let the number be x
9^2 + 2^2 = 6^2 + x
81 + 4 = 36 + x
81-36+4 = x
49 = x
so you can say that the number is either 49 or 7²
 i hope it helps............