Помогите решить !!!!!!!

Question

Помогите решить !!!!!!!

---

Answer 1

1)

1) b³-8c³=(b-2c)(b²+2cb+4c²)

2) 49x²y-y³=y(49x²-y²)=y(7x-y)(7x+y)

3)7a²+14a+7=7(a²+2a+1)=7(a+1)²

4) 5ab-15b-5a+15=5b(a-3)-5(a+3)=(5b-5)(a-3)=5(b-1)(a-3)

5) a⁴-1=(a²)²-(1²)²=(a²-1)(a²+1)

Comments

1)1) b³-8c³=(b-2c)(b²+2cb+4c²)2) 49x²y-y³=y(49x²-y²)=y(7x-y)(7x+y)3)7a²+14a+7=7(a²+2a+1)=7(a+1)²4) 5ab-15b-5a+15=5b(a-3)-5(a+3)=(5b-5)(a-3)=5(b-1)(a-3)5) a⁴-1=(a²)²-(1²)²=(a²-1)(a²+1)

---

1)1) b³-8c³=(b-2c)(b²+2cb+4c²)2) 49x²y-y³=y(49x²-y²)=y(7x-y)(7x+y)3)7a²+14a+7=7(a²+2a+1)=7(a+1)²4) 5ab-15b-5a+15=5b(a-3)-5(a+3)=(5b-5)(a-3)=5(b-1)(a-3)5) a⁴-1=(a²)²-(1²)²=(a²-1)(a²+1)

---

спс