Question

(i) (x - 2y + 6) (x - 2y - 6).​

Answer 1

Answer:

x^2 + 4y^2 - 4xy - 36

Step-by-step explanation:

Answer 2

Step-by-step explanation:

$let \: us \: take \:a= x - 2y \: and \: b = y$

$we \: know \: that \: (a + b )\:( a - b) \\ \: \: \: \: \: \: \: \: \: \: \: = {a}^{2} - {b}^{2}$

$so \: substitute \: it \: \\ \\ we \: get \: \: \: \: \: ({x - 2y})^{2} - {6}^{2} \\ = {x}^{2} + {4y}^{2} - 36$

hope it helps!!