Question

please answer these questions​

Answer 1

Step-by-step explanation:

3.i)

$( {2x + 3y)}^{2} - ( {2x - 3y)}^{2}$

Using the identity, a^2-b^2=(a+b)(a-b), we get,

$= (2x + 3y + 2x - 3y)(2x + 3y - 2x + 3y)$

$= 4x \times 6y$

$= 24xy$

3.ii)

$5a + 7a + 2b + 8b - a + 1$

$= 12a + 10b - a + 1$

$= 11a + 10b - 1$