13.17. Докажите тождество: 1) b(b-4) + (6-8)(b +9)-2 (b- 3)² = 96-90; - - 2) (c + 2)2 - (c - 4)(3 - с) – 0,5(4c2 – 1) = 16,5 – 3с; - 3) (d - 4)(d² + d + 1) – d(d² – 3) = −3d² – 4; 4) (k + 7)(k − 6) - 2(k − 2)² + (k - 3)² = 3k - 41.

помогите пожалуйста, и если не трудно, можно фото с листка ​
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