Question

Solve the question attached​

Answer 1

• B) y = 4a

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Given:

• 
  `log_2 \ y = 2+ log_2\ x`

Find y if x = a:

• 
  `log_2 \ y = 2+ log_2\ a`
• 
  `log_2 \ y =2 log_2\ 2+ log_2\ a`
• 
  `log_2 \ y = log_2\ 2^2+ log_2\ a`
• 
  `log_2 \ y = log_2\ 4+ log_2\ a`
• 
  `log_2 \ y = log_2\ (4*a)`
• 
  `log_2 \ y = log_2\ (4a)`
• 
  `y=4a`

Correct choice is B.