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$The range of x for which the expansion of (4 + 5 x)^{- 7 / 3} is valid$

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35,45

-45,45

-45,-25

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Correct option is B

The expansion is valid ⇒5x4<1⇒|x|<45⇒-45

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The range of x for which the expansion of (4+5x)-7/3 is valid

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$The range of x for which the expansion of (4 + 5 x)^{- 7 / 3} is valid$