Question

The sum of the infinite series 3 +5x+7X² infinity = 6​

Answer 1

Answer:

S = 3 + 5r + 7r^2 + 9r^3 + …..................

rS = + 3r + 5r^2 + 7r^3 + …...........

S (1 – r) = 3 + 2r + 2r^2 + 2r^3 + ….......

S (1 – r) = 3 + 2r / (1 – r)

44/9 * (1 – r)^2 = 3 – 3r + 2r

44 + 44 r^2 – 88r = 27 – 9r

44 r^2 – 79r + 14 = 0

Step-by-step explanation:

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