Question

已知8的3x次方÷16的2x次方=4,求X的值

Answer 1

8^3x÷16^2x=4

(2^3)^3x÷(2^4)^4x=2^2

2^9x÷2^16x=2^2

2^(9x-16x)=2^2

-7x=2

x=-2/7