Помогите:(8b-8)(8b+8)-8(8b+8) При b=2.6

Question

Помогите:(8b-8)(8b+8)-8(8b+8)
При b=2.6

Answer 1

64b(квадрат)-64-64b+64=64*2.6(квадрат)-64-64*2.6+64=432,64-64-166.4+64=266,24

Answer 2

(8×2.6-8)(8×2.6+8)-8(8×2.6+8)=138.24
1)8×2.6-8=12.8
2)8×2.6+8=28.8
3)8×2.6+8=28.8
4)12.8×28.8=368.64
5)8×28.8=230.4
6)368.64-230.4=138.24