Question 14 of 40 Identify the solutions to the quadratic equation,
Check all that apply
x2 + 4x - 21 - 0
A. x =21
B. X= -5
C x=-7
1 D. = 3
I E. x=4

A, D

Step-by-step explanation:

step-by-step explanation:

de-gf

hj=3x+20

ji=15x-64

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.