(7x-10) (7x+10)-49x²-8x+17 при x=130

Question

(7x-10) (7x+10)-49x²-8x+17 при x=130

Answer 1

(7x-10) (7x+10)-49x²-8x+17=
=49x²-100-49x²-8x+17=-8x-83=
=-8•(130)-83=-1040-83=-1123