22longgabriel 22longgabriel

19-04-2020
Mathematics

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PreCalc help with sums. I will mark brainliest. (also can you explain WHY you got what answer you got? Thanks)

PreCalc help with sums I will mark brainliest also can you explain WHY you got what answer you got Thanks class=

Respuesta :

amna04352 amna04352

19-04-2020

Answer:

8

Step-by-step explanation:

a = -4

r = 16/-4 = -4

Sn = a(r^n - 1)/(r - 1)

52428 = -4[(-4)^n - 1]/(-4-1)

(-4)^n - 1 = 65535

(-4)^n = 65536

Means n is even

(4)^n = 65536

nln(4) = ln(65536)

n = 8

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