Question

If 4^x * 5^y = 20, 4^y * 5^x * = 20^2 Then x + y =

Answer 1

Answer:

Step-by-step explanation:

$multiply\\4^x*5^y*4^y*5^x=20*20^2\\4^{x+y}*5^{x+y}=20^{1+2}\\(4*5)^{x+y}=20^3\\20^{x+y}=20^3\\x+y=3$