Question

Which expression is equivalent to square root of -80

Answer 1

i4 squareroot 5 is the answer

Answer 2

hello :
in : C let : √(-80)= z
z² = - 80 .... (1)
but : i² = -1 and : √(80) = 4√5
(1) equivalent : z² = (4√5 i )²
conclusion : z = 4√5 i or z = - 4√5 i