Algebra Problem:

Question

Simplify: 9i²-√-36

(A) -15

(B) -6i - 9

(C) -6 - 9i

(D) 15

(E) None of the above

For this I got; (E) None of the above, because I got -9 - 6i. Is this correct? Or would it be (B) -6i - 9?

Answer 1

Since they are both negative, the order does not matter. The answer is B.

Answer 2

-i - 9 = -9 -i .In the same way how we add like signs (in this case minus) -2 --3 = -3 -2 = -5 So the answer is (B).