Find the Square of : 3a + 7b

Find the square of : 3a + 7b

Sum

We know that
( a + b )² = a² + b² + 2ab
( 3a + 7b )² = 9a² + 49b² + 2 x 3a x 7b
= 9a² + 49b² + 42ab

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Chapter 4: Expansions - Exercise 4 (A) [Page 57]

Chapter 4 Expansions
Exercise 4 (A) | Q 1.2 | Page 57

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0.76 x 0.76 - 2 x 0.76 x 0.24 x 0.24 + 0.24

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\[2x + \frac{3}{x}\]

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9y² – 66yz + 121z²

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