why would you use the points (3,-4) and (-1,-8) to determine the average rate of change of the function g(x)=-x²+3x-4 on the interval -1≤x≤3

Question

amistre64 · Answer

what is the value of g(-1)?  and of g(3)?

(-1, g(-1))  and  (3,g(3))  are the endpoints

amistre64 · Answer

$$avg=\frac{g(3)-g(-1)}{3-1}$$
its just the slope formula

anonymous · Answer

when i do g(3) i get -7 ? :S

anonymous · Answer

wait nvm

amistre64 · Answer

adding and multiplying .... the bane of math :)

anonymous · Answer

i keep making careless mistakes today :(

anonymous · Answer

thanks for the help @amistre64

anonymous · Answer

this time i go g(3)=-4 and g(-1)=-8

anonymous · Answer

got*

amistre64 · Answer

youre welcome,  and we all keep making careless mistakes ... its just the way the pencil pushes