X² - Y² + 2x + 2y [ x + y # 0 ]
X² -Y² [ x - y = 4 ]
(X - Y) • (X + Y) = X² + xy - xy - Y² = X² - Y²
(x + y) (x - y) + 2 (x + y)
(x + y) (x - y)
1 • 4 + 2 (1) = 4 + 2 = 6
1 • 4 = 4 = 4
6:4 = 1,5
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x²-y²+2x+2y
x²- y²
(x+y)(x-y) + 2(x+y) ==> (x+y)(x-y+2)
(x+y)(x-y) (x+y)(x-y)
x - y + 2
x - y
===========================================
x - y = 4
x - y + 2 ==> 4 + 2 ==> 6
x - y 4 4
X² - Y² + 2x + 2y [ x + y # 0 ]
X² -Y² [ x - y = 4 ]
(X - Y) • (X + Y) = X² + xy - xy - Y² = X² - Y²
(x + y) (x - y) + 2 (x + y)
(x + y) (x - y)
1 • 4 + 2 (1) = 4 + 2 = 6
1 • 4 = 4 = 4
6:4 = 1,5