If - then the value of - is-

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Derivative from First Principle

If 𝟒𝟗𝒙𝟐−�...

Question

If $(49 x^{2} - b) = (7 x + 1 / 2) (7 x - 1 / 2)$ , then the value of 𝒃 is:

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\frac{1}{\sqrt{2}}

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\frac{1}{4}

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\frac{1}{2}

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