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y=(x+4)^2 -37

Step-by-step explanation:

y+ ? = x^2 +8x+ ?-21

y+? =x^2+8x +16-21

y+16=x^2+8x+16-21

y+16=(x+4)^2 -21

y=(x+4)^2-21-16

Calculate the difference

y=(x+4)^2 -37

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.