how to simplify and express in terms of i

Question

simplify and express in terms of i

radical divison sign -49

Answer 1

sqrt(-49)

is the same as 7i.  i is equal to -1 and this is an imaginary number.  7 * 7 is 49.

there are only four values that pertain to i.

i = -1

i^2 = 1

i^3 = i

i^4 = -i

Answer 2

i=square root of -1

Answer 3

(5t-2)(3t-8)