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# Domain

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What real values of $x$ are not in the domain of
$f(x)=\frac{1}{(x^2+3x-4)+(x^2+9x+20)}$?

Aug 9, 2021

#1
+12222
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What real values of x are not in the domain of f(x)?

Hello Guest!

$$x^2+3x-4+x^2+9x+20=0\\ 2x^2+12x+16=0\\ x^2+6x+8=0\\ x_1=-4\\ x_2=-2$$

f(-4) and f(-2) are not in the domain of f (x).

!

Aug 9, 2021
edited by asinus  Aug 9, 2021
edited by asinus  Aug 9, 2021
edited by asinus  Aug 9, 2021