Question

Which of the following expressions is equal to x² + 36? *

(x - 6i)²
(x + 6i)²
(x + 9i)(x - 4i)
(x + 6i)(x - 6i)

Answer 1

Answer:

${x}^{2} + 36 \\ factors : - 6i \: and \: 6 i\\ = {x}^{2} + 6i - 6i + 36 \\ = (x - 6i)(x - 6i) \\ = ( {x - 6i)}^{2}$