58
3^2+7^2=9+49=58
2×2+4×4=20 3×3+5×5=34 4×4+3×3=25 2×2+6×6=40
3×3+7×7=58 58 is the right answer...
(a^2)+(b^2)=(c^2) (3^2)+(7^2)=09+49=58 Ans is 58