Question

Expand using suitable identity (2x+y)²​

Answer 1

$\tt({2x + y}) ^{2} = {(2x)}^{2} + 2 \times 2x \times y + {(y)}^{2} \\ = \tt4 {x}^{2} + 4xy + {y}^{2}$

Answer 2

$\color{Red}{(2x)^{2} + 2 \times 2xy + {y}^{2} }$

$\color{Red}{ = {2}^{2} {x}^{2} + 2 \times 2xy + {y}^{2} }$

$\color{Red}{ = 4 {x}^{2} + 2 \times 2xy + {y}^{2} }$

$\color{Blue}{ = 4 {x}^{2} + 4xy + {y}^{2} }$