The length of a rectangle is 4 cm greater than the width of the rectangle.
If the area of the rectangle is 45 square cm, what is the length of the
rectangle?

A) 9 cm
B) 4 cm
C) 5 cm
D) 13 cm

answer:

your answer is: c. 196 7/8 in^3.

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.