The sum of two squares cannot be factored. It can be represented thus:
X2 + y2 = (x + yi)(x - yi)
In this expression, the i is the symbol for the imaginary number the square root of -1.
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Y = x squared -4x plus 3 is an equation of a function. It is neither called a domain nor a range.
3xy + 3y2 = 3y (x + y)
It is the equation of a parabola.
It is the Cartesian equation of an ellipse.
y equals x plus 4 when y equals 0 then x equals 2i i is the square root of negative 1