Question

simplify (x+y-3)(x+y+3)​

Answer 1

Answer:

(x+y-3)(x+y+3)

(X+y)²-3²

x²+y²+2xy-9

Answer 2

Step-by-step explanation:

suppose( x+y ) = a

(a-3)(a+3) = a^2 - 3^2 =a^2 -9 = (x+y)^2 -9 = x^2 +2xy + y^2 - 9