$f(x) = \dfrac{x^2 + 2x - 15}{x^2 - 7x - 18}$ is negative if and only if

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f(x)=x2+2x−15x2−7x−18f(x) = \dfrac{x^2 + 2x - 15}{x^2 - 7x - 18}f(x)=x2−7x−18x2+2x−15​ is negative if and only if