Let f(x)=5/x and g(x) =2x^2+5x. What two numbers are not in the domain of F o G?

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12-07-2017
Mathematics

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Let f(x)=5/x and g(x) =2x^2+5x. What two numbers are not in the domain of F o G?

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mergl mergl · Answer 1 · 2017-07-12T20:46:14+02:00

mergl mergl

12-07-2017

f(x)=5/x
g(x)=2(x^2)+5x
f(x) has a domain of all real numbers excluding zero
g(x) has a domain of all real numbers
fog(x)=5/(2(x^2)+5x)
fog(x)=5/(x(2x+5))
fog(x) has a domain that excludes both zero and -5/2

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