How would one evaluate $$\Phi = \int_{-\infty}^{+\infty} e^{-(ax+bx^2)} dx$$.(adsbygoogle = window.adsbygoogle || []).push({});

I was trying to change it into a product of an error function and a gamma function, but I needed an extra dx. Any other ideas?

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# Integral of an exponential that has a polynomial

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