Упростите:(b-3)(b-4)-(b+4)в квадрате

Question

Упростите:(b-3)(b-4)-(b+4)в квадрате

Answer 1

(b-3)(b-4)-(b+4)^2=b^2-7b+12-(b^2+8b+16)=b^2-7b+12-b^2-8b-16=-15b-4