Question 772069
Hi,

You can use the product rule of exponent: x^n * x^m = x^(n + n)

2^x * 4^(x - 1) 

= 2^x * 2^2(x - 1)

= 2^x * 2^(2x - 2)

= 2^(x + 2x - 2)

= 2^(3x - 2)

Hope it helps you!

John10 (john100185@yahoo.com)