Answer to Question #92470 in Algebra for Karla Carreras

Question

6
Σ 3(-5)^n-1
2

Answer 1

Sum=0

Step 1

N=2

result of this step 3*(-5)^2-1= -15

sum on this step -15

Step 2

N=3

result of this step 3*(-5)^3-1=75

sum on this step -15+75=60

Step 3

N=4

result of this step 3*(-5)^4-1=-375

sum on this step -375+60=-315

Step 4

N=5

result of this step 3*(-5)^5-1=1875

sum on this step 1875-315=1560

Step 5

N=6

result of this step 3*(-5)^6-1=-9375

sum on this step -9375+1560=-7815

Answer: -7815.