Factor:

Question

81a^2+5b^2

Answer 1

81a^2+5b^2
= 81a^2 - 5b^2i^2 , where i = √-1, thus i^2 = -1
= (9a + √5 bi)(9a - √5bi)

Answer 2

14)
An
2
+ 21n + 27 = 7