Question

If 5^x + 1 = 25^x - 2; find the value of :
3^x - 3 x 2^3 - x​

Answer 1

Step-by-step explanation:

5^x+1=25^x-2

5^x+1=5^2x-2

Let 5^x be k

k+1=k²-2

k²-k-3=0

k= 1±√1-4(1)(-3)/2

k= 1±√13/2