7m + 21n 7m = 7 times; m 21n = 3 times; 7 times; n Here, 7 is the common factor of the given terms. Hence, 7m + 21n = 7 (m + 3 times; n) = 7 (m + 3n ...

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Standard VII

Mathematics

Finding the Value of an Expression

Factorise:i 7...

Question

Factorise:

(i) 7m + 21n

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Solution

7m + 21n
7m = 7 × m
21n = 3 × 7 × n
Here, 7 is the common factor of the given terms.
Hence, 7m + 21n = 7 (m + 3 × n)
= 7 (m + 3n)

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Factorise: (i) 7m + 21n

7m + 21n 7m = 7 × m 21n = 3 × 7 × n Here, 7 is the common factor of the given terms. Hence, 7m + 21n = 7 (m + 3 × n) = 7 (m + 3n)

Factorise:

(i) 7m + 21n

7m + 21n
7m = 7 × m
21n = 3 × 7 × n
Here, 7 is the common factor of the given terms.
Hence, 7m + 21n = 7 (m + 3 × n)
= 7 (m + 3n)