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Question Number 121778 by Ar Brandon last updated on 11/Nov/20

The number of integers satisfying the inequality  3^((5/2)log_3 (12−3x)) −3^(log_2 x) >83 is ____

$$\mathrm{The}\:\mathrm{number}\:\mathrm{of}\:\mathrm{integers}\:\mathrm{satisfying}\:\mathrm{the}\:\mathrm{inequality} \\ $$ $$\mathrm{3}^{\left(\mathrm{5}/\mathrm{2}\right)\mathrm{log}_{\mathrm{3}} \left(\mathrm{12}−\mathrm{3x}\right)} −\mathrm{3}^{\mathrm{log}_{\mathrm{2}} \mathrm{x}} >\mathrm{83}\:\mathrm{is}\:\_\_\_\_\: \\ $$

Commented by676597498 last updated on 11/Nov/20

is it .....−3^(log_3 x)  or... −3^(log_2 x)

$$\mathrm{is}\:\mathrm{it}\:.....−\mathrm{3}^{\mathrm{log}_{\mathrm{3}} \mathrm{x}} \:\mathrm{or}...\:−\mathrm{3}^{\mathrm{log}_{\mathrm{2}} \mathrm{x}} \\ $$

Commented byAr Brandon last updated on 11/Nov/20

it′s ...−3^(log_2 x)

$$\mathrm{it}'\mathrm{s}\:...−\mathrm{3}^{\mathrm{log}_{\mathrm{2}} \mathrm{x}} \\ $$

Answered by floor(10²Eta[1]) last updated on 11/Nov/20

12−3x>0⇒x≤3  x>0⇒x≥1  ⇒1≤x≤3  only x=1 and x=2 works

$$\mathrm{12}−\mathrm{3x}>\mathrm{0}\Rightarrow\mathrm{x}\leqslant\mathrm{3} \\ $$ $$\mathrm{x}>\mathrm{0}\Rightarrow\mathrm{x}\geqslant\mathrm{1} \\ $$ $$\Rightarrow\mathrm{1}\leqslant\mathrm{x}\leqslant\mathrm{3} \\ $$ $$\mathrm{only}\:\mathrm{x}=\mathrm{1}\:\mathrm{and}\:\mathrm{x}=\mathrm{2}\:\mathrm{works} \\ $$

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