Lucy bought 9 yards of ribbon on a spool. she cut the ribbon into 1/2 yard pieces, which equation represents the number of pieces of ribbon (n) lucy has now?

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❖ The equation is

n = 18

9 ÷ 1/2 = 9 x 2/1 = 18/1 = 18

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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.