Подробное решение 5,214^2-2,214^2

Question

Подробное решение 5,214^2-2,214^2

Answer 1

(5.214-2.214)(5.214+2.214)=7,428 × 3 = 22,284

Answer 2

A² -b² =(a -b)(a +b)

5.214² -2.214² =(5.214 -2.214)(5.214 +2.214) =
=3 * 7.428 = 22.284