Answer to Question #100233 in Algebra for Jake

Question #100233
Find the domain and range of f(x)=3/×^2+2
1
Expert's answer
2019-12-11T10:45:30-0500

f(x)=3x2+2f(x)= \cfrac{3}{x^2}+2 .

Given that x is in the denominator, it cannot be equal to 0.

So, the domain of this function is x(,0)(0;+)x \in (- \infty, 0)∪(0; + \infty).

The value 3x2\cfrac{3}{x^2} could not be less than 0 because x2>0x^2 >0 for all x.

The value  3x2\cfrac{3}{x^2} could not be equal 0.

All of theese means that value 3x2+2>2\cfrac{3}{x^2}+2 > 2 for all x.

So, the range of f(x)f(x) is (2,+)(2, + \infin ) .

Answer: Domain is (,0)(0,+)(- \infty, 0)∪(0, + \infty) , range is (2,+)(2, + \infin ) .



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