#### (i) (2x + 7y)^{2}

#### (ii) (1/2 x + 2/3 y)^{2}

**Answer :**

**(i) (2x + 7y)**^{2}

^{2}

It can be written as

= (2x)^{2} + 2 × 2x × 7y + (7y)^{2}

So we get

= 4x^{2} + 28xy + 49y^{2}

**(ii) (1/2 x + 2/3 y)**^{2}

^{2}

It can be written as

= (1/2 x)^{2} + 2 × ½x + 2/3y + (2/3 y)^{2}

So we get

= ¼ x^{2} + 2/3 xy + 4/9 y^{2}

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