It is an inequality that defines all numbers (in the domain) such that they are not 3 or more.
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That factors to (x - 6)(x + 3) x is less than or equal to -3, 6
x is less than or equal to negative 3 or x< or =-3
y is 2 less than the product of 3 and x
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If you mean x^2 -9 then it is (x-3(x+3) when factored which is the difference of two squares