Find the sum of the first five terms of the following, show your solution.
1.-10, -20, -40, -80,...
2.2x, 4x, 8x, 16,...
1.-10, -20, -40, -80,...
2.2x, 4x, 8x, 16,...
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Answers & Comments
Answer:
1. -310
2. 62x
Step-by-step explanation:
1. -10,-20,-40,-80,...
a1=-10
n=5
r=2
Sn=
S5=
S5=
S5=
S5=
S5=-310
2. 2x,4x,8x,16x,...
a1=2x
n=5
r=2
Sn=
S5=
S5=
S5=
S5=
S5=62x
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Answer:
1. -10, -20, -40, -80, -160, -320, -640, -1280, -2560
2. 2x, 4x, 8x, 16x, 32x, 64x, 128x, 256x, 512x
Step-by-step explanation:
simply, -10+-10= -20, -20+-20= -40...
(same as the solution at the above)
(correct me if I'm wrong)