(3x + 5) (- 3x + 5) - x (7x + 8) (7x-8) - (8x) where x = - 2

(3x + 5) (- 3x + 5) - x (7x + 8) (7x-8) - (8x) where x = - 2

Original formula = 25-9x ^ 4-x & # 178; (49x & # 178; - 64) - 64x & # 178;
=35-9x^4-49x^4+64x²-64x²
=-58x^4+35
=-928+35
=-893