factorise: p²-13pq+36q²
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Step-by-step explanation:
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Step-by-step explanation:
p²-13pq+36q²
⇒ p²-4pq-9pq+36q²
⇒p(p-4q)-9q(p+4q)
⇒ (p-4q)(p-9q)
(regrouping terms)
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