How do I solve this?

Question

125x^3 + 343 = 0
Please help me!

Answer 1

Hints:
125x^3 + 343 = 0
(5x)³ - 7³ = 0

and

a³-b³=(a-b)(a&sup2+ab+b²)

Answer 2

Thank you!

Answer 3

You're welcome!