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# Help with domain

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What real values of x are not in the domain of $f(x) = \frac{1}{|x^2 + 3x - 4| + |x^2 + 9x - 10|}$?

Jun 9, 2021

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$$f (x) = {1\over |(x-1) (x+4)+|(x-1)(x+10)|}$$

if x = 1, then

$$f(x) = {1 \over0}$$

f(x)  is undefined,  when x = 1.

Jun 10, 2021