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logx 243 = 2.5, then value of x will be :(A) 9(B) 3(C) 1(D) 81 |
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Answer» Answer is (A) 9 ∵ logan = x ⇒ ax = n Similarly logx 243 = 2.5 ⇒ 243 = x2.5 ⇒ x5/2 = 243 = (3)5 Squaring on both sides, (x5/2)2 = {(3)5}2 ⇒ x5/2 = (32)2 On comparing, x = 32 = 9 |
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