Find the square of 2a + b.

Sum

We Know that

(a + b)² = a² + b² + 2ab

(2a + b)² = 2a² + b² + 2 × 2a × b

= 4a² + b² + 4ab

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Chapter 4 Expansions
Exercise 4 (A) | Q 1.1 | Page 57

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`x^2 - y^2/100`

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(0.5−2a) (0.5+2a)

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(999)²

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Factorise the following:

4x² + 20x + 25