Question

geometric series

Answer 1

I need help putting it into an equation

Answer 2

\(a + ar + ar^{2} + ar^{3} = a\dfrac{1-r^{4}}{1-r}\)

Answer 3

\[343+343*-(1/7)+343*-(1/7)^2+343*-(1/7)^3=400=343\frac{ 1+(1/7)^4 }{ 1+(1/7) }\]

Answer 4

actually 286 sorry forgot the negative

Answer 5

I am a little troubled by your signs. Be more careful with your notation. It will save you!

\(343 + 343(-1/7) + 343(-1/7)^{2} + 343(-1/7)^{3} = 343\dfrac{1-(-1/7)^{4}}{1 - (-1/7)}\)

That is NOT what you have written.