The square of a number of the form 5 + a is equal to

5(5 + 2a) + a²

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(25 + a) + 100 + a²

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(25 + a) × 100 × a²

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(25 × a) + 100 + a²

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Solution

The correct option is A
5(5 + 2a) + a²

(5 + a)² = 5² + 2 × 5 × a + a²

= 25 + a² + 10a

= 25 + 10a + a²

= 5(5 + 2a) + a²

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The square of a number of the form 5 + a is equal to

The correct option is A 5(5 + 2a) + a2 (5 + a)2 = 52 + 2 × 5 × a + a2 = 25 + a2 + 10a = 25 + 10a + a2 = 5(5 + 2a) + a2

The correct option is A
5(5 + 2a) + a²

(5 + a)² = 5² + 2 × 5 × a + a²

= 25 + a² + 10a

= 25 + 10a + a²

= 5(5 + 2a) + a²