Question

Factor
• 1/343 x3 - 1/125
• 0.001b3 - 8

- send help •-•'​

Answer 1

[1/7 x - 1/5][(1/49 x²)+(1/35 x)+(1/25)]

(0.1b - 2)[0.01b²+0.2b+4]

Explanation:

a³-b³=(a-b)(a²+ab+b²)

So

1/343 x³ - 1/125

[(1/7)x]³ - [1/5]³

[1/7 x - 1/5][(1/7 x)²+(1/7 x)(1/5)+(1/5)²]

[1/7 x - 1/5][(1/49 x²)+(1/35 x)+(1/25)]

And

0.001b3 - 8

(0.1b)³-(2)³

(0.1b - 2)[(0.1b)²+(0.1b)(2)+2²]

(0.1b - 2)[0.01b²+0.2b+4]