Factorise : m^2 - 4m - 21....

Factorise : `m^2 - 4m - 21`.

A

`(m + 3)^2`

B

(m + 7) (m - 31)

C

3 (3a + 4b) (4a - 9b)

D

(m - 7) (m + 3)

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VGS PUBLICATION-BRILLIANT-FACTORISTION-EXERCISE

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Factorise : m^2 - 4m - 21.
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