expand using suitable identities: (7x+1/2) (7x-1/2)

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Solution

$(7 x + \frac{1}{2}) (7 x - \frac{1}{2}) = {(7 x)}^{2} - {(\frac{1}{2})}^{2} {using the identity (a + b) (a - b) = a^{2} - b^{2}} = 49 x^{2} - \frac{1}{4}$

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Question 85 (xiv)

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