Answer :
7i
=√7 * √-7
=√(7*-7)
=√-49
= i√49
=7i : you cannot square root a negative number so you take out an imaginary number which is i, making it possible to square root.
=√7 * √-7
=√(7*-7)
=√-49
= i√49
=7i : you cannot square root a negative number so you take out an imaginary number which is i, making it possible to square root.