512=-4(-2)^n-1 find n in geometric sequence
2 answers:
Answer:
n = 8
Step-by-step explanation:
Rearrange the equation to find n:
512/-4 = 
-128 =
= -128
So, n-1 = 7
n = 8
Answer:
n = 8
Step-by-step explanation:
512/-4 = -128
-2^? equals -128? Has to be odd since it's negative
-2^1 = -2
-2^3 = -8
-2^5 = -32
<u>-2^7 = -128</u>
But it's -2^n-1 = -128 so you have to add 1
7+1 = 8
So n=8
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