(6b-8)(8b+6)-8b(6b+8) при b=-3 плиз.... срочно!!!

Question

(6b-8)(8b+6)-8b(6b+8) при b=-3 плиз.... срочно!!!

Answer 1

(6b-8)(8b+6)-8b(6b+8) =48b²+36b-64b-48-48b²-64b=-92b-48
b=-3; -92·(-3)-48=276-48=228