What real values of $x$ are not in the domain of $f(x)=\frac{1}{(x^2+3x-4)+(x^2+9x+20)}$?
What real values of x are not in the domain of f(x)?
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\(x^2+3x-4+x^2+9x+20=0\\ 2x^2+12x+16=0\\ x^2+6x+8=0\\ x_1=-4\\ x_2=-2\)
f(-4) and f(-2) are not in the domain of f (x).
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