Question

find 1)(2a+6b)² 2)(6a-b) ²

Answer 1

1) (2a+6b)²

(2a)²+2(2a)(6b)+(6b)²

4a²+24ab+36b²

2)(6a-b)²

(6a)²-2(6a)(b)+b²

36a²-12ab+b²

Answer 2

$1. \: (2a + 6b {)}^{2} \\ \\ expand \: the \: given \: expression \: \\ by \: using \: - \\ \\ (a + b) {}^{2} = {a}^{2} + 2ab + {b}^{2} \\ \\ (2a {)}^{2} + 2(2a)( 6b)+ ( {6b})^{2} \\ \\ {4a}^{2} + 24ab + 36 {b}^{2}$


$2. \: (6a - b {)}^{2} \\ \\ expand \: the \: given \: expression \: by \: using \: \\ (a - b {)}^{2} = {a}^{2} - 2ab + {b}^{2} \\ \\ ( {6a})^{2} - 2(6a)(b) + {b}^{2} \\ \\ 36 {a}^{2} - 12ab + {b}^{2}$