domain and range

Question

+1

508

1

+501

What is the sum of all real numbers $x$ that are not in the domain of the function

$f(x) = \frac{1}{x^2-7} + \frac{1}{x^3-8} + \frac{1}{x^4-9}~?$

ellapow Feb 24, 2021

ElectricPavlov · Answer 1 · 2021-02-24T05:12:18

You cannot have any ZERO denominators...

so x^2 cannot = 7 x cannot = +- sqrt 7

x^3 cannot equal 8 x cannot = 2

x^4 cannot equal 9 x cannot = +- sqrt 3 sum = 2