Part of the graph of the function f(x) = (x – 1)(x + 7) is shown below. which statements about the function are true?
(select three options). (a)the vertex of the function is at (–4,–15). (b)the vertex of the function is at (–3,–16). (c)the graph is increasing on the interval x > –3. (d)the graph is positive only on the intervals where x < –7 and where x > 1. (e)the graph is negative on the interval x < –4.
(answers are b c d)!

the answers are B,C,D

Step-by-step explanation:

its 4 because 2 times 2 is 4, if you double the number two you get four

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.