Fourier transforming something of the form x(at+b) when the transform of x(t) is known is slightly more difficult than one would think. For instance, if we want to transform x(-t-1), should we shift or invert first? Not being sure, perhaps it would be better to use the definition of a Fourier transform to solve this.
$ F(x(t))=\int_{-\infty}^\infty x(t)e^{-j\omega t} dt $
