p²-q² when p-q=9 and pq=36
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Step-by-step explanation:
Given: p-q=9 pq=36 i)
given p-q =9 (p-q)²=9²
(squaring both sides LHS and RHS) p²+q²-2pq = 81 p²+q²-2×36=81
p²+q2 = 81-72
= 9
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