Question

Using suitable identity, find (x-2y+3)(x+2y-3)²​

Answer 1

Answer:

From given, we have,

(3) (7x/4 - 2y/3)2

Considering the identity 2 to be (a - b)² = a²+ b² - 2ab

:: (7x/4 - 2y/3)²

→ a= 7x/4

b = 2y/3

.. (7x/4 - 2y/3)² = (7x/4)² + (2y/3)² - 2 (7x/

4) (2y/3)

= 49x²/16 + 4y²/19 - 7xy/3

(7x/4 - 2y/3)² = 49x²/16 + 4y²/9 - 7xy/3