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Real Valued Functions

If p=q +2 a...

Question

If $p = q + 2$ and $p + q = 5$ .Then find $p^{2} - q^{2}$

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Solution

$p - q = 2 a n d p + q = 5 ∴ p^{2} - q^{2} = (p - q) (p + q) = 2 \times 5 = 10$

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