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Factorize the expression m^2 -10 m + 21.

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Factorize the expression m2 -10 m + 21.

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m2 – 10 m + 21

⇒ m2 – (7m + 3m) + 21

⇒ m2 – 7m – 3m + 21

⇒ m (m – 7) – 3 (m – 7)

⇒ (m – 7) (m- 3)

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