For each of the quadratic equations below, convert them into the standard form ax^2+bx+c=0 and determine the value of 'b^2-4ac. Comment on the nature of roots from the value of 'b^2-4ac
(i) 5x^2=6x-7
(ii) 4x^2+16=-16x
(iii) 2x^2+6x+3=0
What is the value of {i^i}
Where i = \sqrt { - 1}