Which of the following is equivalent to the expression below for all values of x where the expression is defined?
13
x − 1
+
7
x + 1

F
20
x2−1

H
20x+6
x2−1

G
6x+20
x2−1

J
20x
x2−1

step-by-step explanation:

sry but any answer choices

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.