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  4. Frame the formula: The square of the difference of p and q is equal to the sum of p2, q2 and (-2pq).

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Q. Frame the formula: The square of the difference of $p$ and $q$ is equal to the sum of $p^2, q^2$ and (-2pq).

Formulae

Solution:

Correct answer is (a) $(p-q)^2=p^2+q^2-2 p q$