Find the sum S(x) of the series by finding . I multiplies the series by (1-x) and got And the sum of this would be Then what would S(x) be? ? The answer is supposed to be Thanks
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Originally Posted by arze Find the sum S(x) of the series by finding . I multiplies the series by (1-x) and got Mr F says: This is wrong. It's . And the sum of this would be Then what would S(x) be? ? The answer is supposed to be Thanks ..
So i find the sum of the series ?
Originally Posted by arze So i find the sum of the series ? No. . The red stuff is a geometric series - use the usual rule to get an expression for it. Then make S(x) the subject and simplify the result (simplifying should be easy since you know the answer to aim for).
Hello, arze! Find the sum: . .by finding The answer is: . . . .[1] . . The geometric series has sum: . So [1] becomes: . . Hence: . Therefore: .
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