Jamal uses the steps below to solve the equation 6x – 4 = 8.
Which property justifies Step 3 of his work?
Step 1: 6x - 4 + 4 = 8 + 4
Step 2: 6x + 0 = 12
Step 3: 6x = 12
O the addition property of equality
O the identity property of addition
O the multiplication property of equality
o the identity property of multiplication
Step 4: 6x =
Step 5: 1x = 2
Step 6: x = 2
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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.

d. you cannot tell because there are no values shown.