Q3 Factorise the following expressions

(II)

7p^2 + 21 q ^2

Answers (1)

We have,
              7p^2 = 7 \times p \times p
             21q^3 = 3 \times 7 \times q \times q
Therefore,   
                     7p^2 + 21 q ^2  = (7 \times p \times p) + (3 \times 7 \times q \times q)
                                             =7(p^{2}+ 3q^{2})

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