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(i) (8a + 3b)2 

(ii) (7x + 2y)2

(iii) (5x + 11)2

(iv) (a/2 + 2/a)2

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Best answer

(i) Given, 

(8a + 3b)2 

By using the formula (a + b)2 = a2 + b2 + 2ab 

We get; 

= (8a)2 + (3b)2 + 2 × 8a × 3b 

= 64a2 + 9b2 + 48ab

(ii) (7x + 2y)2

By using the formula (a + b)2 = a2 + b2 + 2ab

We get;

= (7x)2 + (2y)2 + 2 × (7x) × (2y)

= 49x2 + 4y2 + 28xy

(iii) (5x + 11)2

By using the formula (a + b)2 = a2 + b2 + 2ab

We get;

= (5x)2 + (11)2 + 2×(5x) × 11

= 25x2 + 121 + 110x

(iv) \((\frac{a}{2}+\frac{2}{a})^2\)

By using the formula (a + b)2 = a2 + b2 + 2ab

We get;

\((\frac{a}{2}+\frac{2}{a})^2\)

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