Question

Hey can you please help me posted picture of question

Answer 1

The correct answer is option D

The solution is shown below:


`x^(2) +16 \\ \\ = x^(2) +(4)^(2) \\ \\ = x^(2) -(-1)(4)^(2) \\ \\ = x^(2) -i^(2) (4)^(2) \\ \\ = x^(2) -(4i)^(2) \\ \\ =(x+4i)(x-4i)`