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simplify-3-x-63-21-x-2-7-x-1-




Question Number 152844 by bobhans last updated on 02/Sep/21
           simplify              ((3^x  + 63)/(21^(x−2)  + 7^(x−1) ))
$$\:\:\:\:\:\:\:\:\:\:\:{simplify}\: \\ $$$$\:\:\:\:\:\:\:\:\:\:\:\frac{\mathrm{3}^{{x}} \:+\:\mathrm{63}}{\mathrm{21}^{{x}−\mathrm{2}} \:+\:\mathrm{7}^{{x}−\mathrm{1}} }\: \\ $$
Answered by Rasheed.Sindhi last updated on 02/Sep/21
           ((3^x  + 63)/(21^(x−2)  + 7^(x−1) ))              ((3^x  + 3^2 ×7)/((3×7)^(x−2)  + 7^(x−1) ))              ((3^2 (3^(x−2)  + 7))/(7^(x−2) (3^(x−2)  + 7))) =(9/7^(x−2) )
$$\:\:\:\:\:\:\:\:\:\:\:\frac{\mathrm{3}^{{x}} \:+\:\mathrm{63}}{\mathrm{21}^{{x}−\mathrm{2}} \:+\:\mathrm{7}^{{x}−\mathrm{1}} }\: \\ $$$$\:\:\:\:\:\:\:\:\:\:\:\frac{\mathrm{3}^{{x}} \:+\:\mathrm{3}^{\mathrm{2}} ×\mathrm{7}}{\left(\mathrm{3}×\mathrm{7}\right)^{{x}−\mathrm{2}} \:+\:\mathrm{7}^{{x}−\mathrm{1}} }\: \\ $$$$\:\:\:\:\:\:\:\:\:\:\:\frac{\mathrm{3}^{\mathrm{2}} \cancel{\left(\mathrm{3}^{{x}−\mathrm{2}} \:+\:\mathrm{7}\right)}}{\mathrm{7}^{{x}−\mathrm{2}} \cancel{\left(\mathrm{3}^{{x}−\mathrm{2}} \:+\:\mathrm{7}\right)}}\:=\frac{\mathrm{9}}{\mathrm{7}^{{x}−\mathrm{2}} } \\ $$$$ \\ $$

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