Question

find the value of x(5/7)^-3x X (5/7)^5x+12 = (5/7)^40​

Answer 1

Answer:

14

Step-by-step explanation:

(5/7)^-3x × (5/7)^5x +12 = (5/7)^40

Multiplying equal bases add the powers

-3x + 5x + 12 = 40

2x + 12 = 40

2x = 28

x = 28/2 = 14