Electrical engineers find it convenient to model impedance with complex numbers. In a parallel AC circuit with two impedances 21 and 22, the equivalent or total impedance in ohms can be determined by using the Z₂ Z2 formula Zeg Find the equivalent impedance Zeg for 21 = 2-i and 21-22 22 = 1 + i arranged in a parallel AC circuit. The equivalent impedance in a parallel AC circuit is Zeq = i.

solution:

the given function is ,

      =

the three roots of this quadratic function is , 0 ,8 and 10.all the roots are real and rational.

if a quadratic equation is of the form ,

sum of the roots = a + b +c= 0+8+10=18=  

product of roots taken two at a time = a b + b c+ c a = 0+80+0=80 =  

product of roots = a b c = 0=  

there are 11 doors in a hall starting from 0 to 11.the entry in the hall is permitted through gate number 0 and exit is allowed through only gate number 8 and 10.so, three roots(0,8,10) of quadratic function is given by entry and exit route of this hall.