Преобразуйте многочлен (5-b)(5+b)-2b(b-3)

Question

Преобразуйте многочлен (5-b)(5+b)-2b(b-3)

Answer 1

.................................

---

Answer 2

(5-b)(5=b)-2b(b-3)=5^2-b^2-2b^2+6b=-3b^2+25+6b