234² – 17³ = 49.843
= (234 x 234) – (17 x 17 x 17)
= 54.756 – (289 x 17)
= 54.756 – 4.913
= 49.843
__________
21⁴ – 63² + 11² = 194.481
= (21 x 21 x 21 x 21) – (63 x 63) + (11 x 11)
= (441 x 21 x 21) – 3.969 + 121
= (9.261 x 21) – 3.969 + 121
= 194.481
__________
√100 ÷ 2 = 5
= √10² ÷ 2
= 10 ÷ 2
