(3b-c)(3b+c)=9b^2-c^2

Question

(3b-c)(3b+c)=9b^2-c^2

Answer 1

(3b-c)(3b+c)=9b^2-c^23b^2-c^2=9b^2-c^2

Comments

3b-c)(3b+c)=9b^2-c^23b^2-c^2=9b^2-c^2

---

3b-c)(3b+c)=9b^2-c^2

---

3b^2-c^2=9b^2-c^2

---

и мне пж