factorising it. its question from algebra
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P⁴ +7P²q² + 16q⁴
= P⁴ +8P²q² + 16q⁴ -P²q²
=P⁴ +2.P².4q² + (4q²)² - (Pq)²
={P² + 4q²}² - (Pq)²
={P²+ 4q² -Pq} {P² + 4q² + Pq }
= P⁴ +8P²q² + 16q⁴ -P²q²
=P⁴ +2.P².4q² + (4q²)² - (Pq)²
={P² + 4q²}² - (Pq)²
={P²+ 4q² -Pq} {P² + 4q² + Pq }
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