A teacher gave her class two functions, f(x) = (x - 5] + 4 and g(x) = -x2 + 21, and asked for the solution(s) of the equation
f(x) = g(x). The answers given by four students are shown below:
Betty: only 4
Donna: only 5
Edward: 12 and 5
Gary: -3 and 4
Who found the solution correctly and why?

maybe - definition of supplementary angles. im not sure. sorry

step-by-step explanation:

figure c

step-by-step explanation:

hope this .

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.

answerim :

n

step-by-step explanation:

im not sure but my dad knows