2
if f(x) = -7x +5x +10 what does f(-2) equal
f(-2) =
5 is squared

Step-by-step explanation:

Given

f(x) = -7x + 5x +10

f(-2) = -7 * (-2) + 5* (-2) + 10

= 14 -10 +10

= 14

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.