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To find the domain or range, solve for a variable and see if the other variable has any restrictions on it. In this case, x2 + y = 4
y = 4 - x2
There are no restrictions on x, therefore x is in the domain of all real numbers.
x = square root(4 - y)
Since the argument (number in brackets) of a square root must be positive, 4 - y > 0, y < 4.
Domain: x can be all real numbers.
Range: y can be all real numbers less than or equal to 4.
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