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19-11-2016
Mathematics

contestada

What is the average rate of change of f(x)=7-8x; x=-2, x=4?

Respuesta :

19-11-2016

f(x)=7-8x

f(-2)=7-8×(-2)
=7-(-16)
=7+16
=23

f(4)=7-8×4
=7-32
=-25

average=[23+(-25)]÷2
=(23-25)÷2
=(-2)÷2
=-1

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