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Question
Make a the subject of formula S = `("a"("r"^"n" - 1))/("r" - 1)`
Solution
S = `("a"("r"^"n" - 1))/("r" - 1)`
⇒ S(r - 1) = a(rn - 1)
⇒ `("S"("r" - 1))/(("r"^"n" - 1)` = a
⇒ a = `("S"("r" - 1))/(("r"^"n" - 1)`.
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