Question

Expanded form of (3x+7y)² is: *

Answer 1

9x^2+42xy+49y^2 is the expanded from

Answer 2

Step-by-step explanation:

GIVEN:-

$(3x + </strong><strong>7</strong><strong>y)^{2} \\ \\ w e \: know \: (a + b)^{2} = {a}^{2} + 2ab + {b}^{2} \\ now \: simplifying \: it \: gives \\ \\ (3x + </strong><strong>7</strong><strong>y)^{2} = {(3x)}^{2} + 2(3x)(</strong><strong>7</strong><strong>y) + {(</strong><strong>7</strong><strong>y)}^{2} \\ = 9 {x}^{2} + </strong><strong>4</strong><strong>2</strong><strong>xy + </strong><strong>4</strong><strong>9</strong><strong>{y}^{2}$