Question

Tim x :

9^x-1=9

2^x. 2^5=64

75-4.(x+

4)=71

 

Answer 1

9^{x - 1} = 9

=> 9^{x - 1} = 9¹

=> x - 1 = 1 => x = 2

Answer 2

2^x . 2⁵ = 64

2^x . 2⁵ = 2⁷

=> x + 5 = 7

=> x = 2

Answer 3

75 - 4 . ( x + 4 ) = 71

 4x + 16 = 4

4x = - 12

=> x = - 3