Which rational expression does not have any excluded values? x + 2 over 2x^2
2x + 4 over 3x + 3
6x - 5 over x^2 - 7
x + 2 over -x^2 - 5

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.

r = 78539458390583095803458309458039485093485 or just 3

step-by-step explanation: