Question

Find the value of ‘x’ in the given expression

(49/16)x× (64/343)x-1= 4/7

A 4 Correct Answer Incorrect Answer
B 3 Correct Answer Incorrect Answer
C 2 Correct Answer Incorrect Answer
D -2 Correct Answer Incorrect Answer

Solution

(49/16)x× (64/343)(x-1) = 4/7 ⇒(7/4)2x× (4/7)(3x-3) = 4/7 ⇒(4/7)(-2x)× (4/7)(3x-3) = 4/7 ⇒ -2x+3x-3=1 ⇒ x = 4

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