Question

what am i doing wrong here

Consider the function f(x)=2x^2+6x+9 on the interval [−4,7]. Find the average or mean slope of the function on this interval


when I plug in 7 into the equation i get 780, and when I plug in -4, I get -47.

To find the mean slope

(780-(-47))/(7-(-4)) = 71

71 wont work however

Answer 1

\[f(7)\neq780\]

Answer 2

i got 149 when x=7

Answer 3

\[f(-4)=17\]I mean

Answer 4

damn .. what I am getting f(7)-f(-4) = 132

Answer 5

and avg slope is 12 ...

Answer 6

i got it thanks