#### (i) 21py^{2} – 56py

#### (ii) 4x^{3} – 6x^{2}

**Sol: **(i) 21py^{2} – 56py

Take out common in both terms,

Then, 7py (3y – 8)

Therefore, HCF of 21py^{2} and 56py is 7py.

(ii) 4x^{3} – 6x^{2}

4x^{3} – 6x^{2}

Take out common in both terms,

Then, 2x^{2} (2x – 3)

Therefore, HCF of 4x^{3} and 6x^{2} is 2x^{2}.

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