A little FACTORING help. Shouldn't be hard, i'm just rusty.?

Question

1. 56p^6q^6 - 77p^4q^4 + 7p^2q^3 (factor completely)

2.y^3 - 8z^3 I have gotten this far but i'm unsure where 2 put the "8"

(y-z)(y^2 - yz - z^2)

3. 2a^2(b-5)^3-a(b-5)^3-21(b-5)^3

Answer 1

1.

56p^6q^6 - 77p^4q^4 + 7p²q³ =   ...factor out a p²

p²(56p^4q^6 - 77p²q^4 + 7q³) =   ...factor out a q³

p²q³(56p^4q³ - 77p²q + 7) =   ...factor out a 7

7p²q³(8p^4q³ - 11p²q + 1) =

2.  y³ - 8z³ = (y - 2z)(y² + 2yz + 4z²)

3.

2a²(b - 5)³ - a(b - 5)³ - 21(b - 5)³ =

(b - 5)³(2a² - a - 21) =

(b - 5)³(a + 3)(2a - 7)

Hope this helps you!