Find the sum of the first seven terms of the geometric series 8, - 24, 72, ...

4,376

4,280

5,832

5,836

4376

Step-by-step explanation:

8, - 24, 72, - 216, 648, - 1944, 5832

Multiply the next number by - 3

8 x - 3 = - 24

-24 x - 3 = 72

72 x - 3 = - 216

-216 x - 3 = 648

648 x - 3 = - 1944

-1944 x - 3 = 5832

adding all 7 numbers

8 + (-24) + 72 + (-216) + 648 + (-1944) + 5832 = 4376