Question

 Product of (2x+9y)(2x-9y) is:​

Answer 1

Answer:

$(2x + 9y)(2x - 9y)$

$= {(2x)}^{2} - {(9y)}^{2}$

$= 4 {x}^{2} - 81 {y}^{2}$

$By \: using \: the \: identity, \:$

$(a + b)(a - b) = {a}^{2} - {b}^{2}$

Answer 2

$\sf{Answer}$

Step by step explanation:-

Given :-

(2x + 9y) ( 2x - 9y)

To find :-

Product

Formula

It is in form of (a + b) ( a - b ) = a²-b²

By using this identity we can solve this problem

Solution:-

(2x + 9y) ( 2x -9y)

(a+b)(a-b) = a²-b²

Similarly,

(2x + 9y) ( 2x -9y) = (2x)² - (9y)²

(2x + 9y) ( 2x -9y) = 4x² - 9y²

So , Required answer is 4x²-9y²