(x - y)2 = x2 - 2xy + y2
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D = {x [element of reals]}R = {y [element of reals]|y >= 4}
Only when X or Y = 0 That is because (x + y) squared = x^2 + 2xy + y^2 x^2 + 2xy + y^2 = x^2 + y^2 when x or y = 0
X + y
You must use the difference of squares formula: x2 - y2 = (x + y)(x - y) Thus: x2 - 25 = (x + 5)(x - 5).
The GCF is xy