SileIbdawn SileIbdawn

07-07-2016
Mathematics

contestada

I need help solving an=a1+(n-1)d and I'm suppose to solve for d. I need help please :)

Respuesta :

meerkat18 meerkat18

14-07-2016

The first thing to know is that "an" and "a1" are names with subscripts and are and different from multiplication.
an = a1 + (n-1) d
add -a1 to both sides
an - a1 = a1 - a1 + (n-1) d
an - a1 = (n-1) d
d = (an-a1)/(n-1)

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