Find the Square of : 3a + 7b

Find the square of : 3a + 7b

योग

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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अध्याय 4: Expansions - Exercise 4 (A) [पृष्ठ ५७]

अध्याय 4 Expansions
Exercise 4 (A) | Q 1.2 | पृष्ठ ५७

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(2x + 1)³

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64m³ – 343n³

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The coefficient of x in the expansion of (x + 3)³ is ______.