(b + 4)2 – 2b(5b + 4) решите пож

Question

(b + 4)2 – 2b(5b + 4) решите пож

Answer 1

2b+8-10b^2+8b=10b+8-10b^2

Answer 2

(b + 4)2 – 2b(5b + 4)=b^2+8b+16-10b^2-8b=-9b^2+16