When a > 5 and b ≤ 5, a@b = (a + b)(a - b), and when a ≤ 5 and b > 5, a@b = (b + a)(b - a). What is the value of 2*((2 @ 6) @ -4) -1?
2*( (2 @ 6) @ -4 ) - 1
2 @ 6 = (6 + 2)(6 - 2) = (8)(4) = 32 because a ≤ 5 and b > 5
= 2*( 32 @ -4 ) - 1
32 @ -4 = (32 + -4)((32 - -4) = (28)(36) = 1008 because a > 5 and b ≤5
= 2*(1008) - 1
= 2016 - 1
= 2015
