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Question

For what values of x will the expression represent a real number? Write answers using inequality notation.
3x27x6

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Solution

Domainof3x27x6:x23orx3

Rangeof3x27x6:[Solution:f(x)0IntervalNotation:[0,)]

ExtremePointsof3x27x6:Minimum(23,0),Minimum(3,0)

f(x)=6x723x27x6

Thecriticalpoints:x=23,x=3

Therangefortheinterval<x23:0f(x)<

Therangefortheinterval3x<:0f(x)<

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