Show that: (9p – 5q)2 + 180 pq = (9p+5q)2
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LHS:(9p-5q)^2+180pq=81p^2+25q^2-90pq+180pq=81p^2+25q^2+90pq then RHS:(9p+5q)^2=81p^2+25q^2+90pq (LHS=RHS) therefore (9p-5q)^2+180pq=(9p+5q)^2
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