(2a - 3x - 3y)(2a + 3x + 3y)
Hi there !
use formula
a² - b² = (a - b)(a + b)
a = 2a
b = 3(x + y)
4a² - 9(x+y)² =
= [2a - 3(x + y)][2a + 3(x + y)]
= (2a - 3x - 3y)(2a + 3x + 3y)
Good luck !
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