Evaluate: (5/8)⁻⁷ x (8/5)⁻⁴

(5/8)⁻⁷ x (8/5)⁻⁴ = 5⁻⁷/8⁻⁷ x 8⁻⁴⁻(⁻⁷) [∵ (a/b)ᵐ =aᵐ/bᵐ]
= 5⁻⁷⁻(⁻⁴) x 8⁻⁴⁻⁷ [∵ aᵐ÷aⁿ=aᵐ⁻ⁿ]
= 5⁻⁷⁺⁴x8⁻⁴⁺⁷ = 5⁻³x8³ =8³/8³ [∵ a⁻ᵐ=1/aᵐ]
= 512/125

Class 8 Maths Chapter 11 Exercise 12.1 Solution in Video

for more answers vist to:
https://www.tiwariacademy.com/ncert-solutions/class-8/maths/chapter-12/