Same Domain

Algebra Level 2

Set X={6,6}X=\{-6, 6\} is the domain of two functions f(x)=ax+b,g(x)=x2+3x1,f(x)=ax+b, g(x)=-x^2+3x-1, where aa and bb are constants. If f=g,f=g, what is the value of ab?a-b?

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