Question

If 2^y = 128, find the value of (2^y-1)(5^y-2)

Answer 1

Step-by-step explanation:

$\huge\underline{\underline{\sf ANSWER}} \\ ({2})^{y} = 128 \\ {(2)}^{y} = ({2})^{7} \\ y = 7 \\ \\ ( {2}^{y} - 1)( {5}^{y} - 2) \\ ( {2}^{7} - 1)( {5}^{7} - 2) \\ (128 - 1)(78125 - 2) \\ (127)(78123) \\ 9921621$