s8arattykaylahxx s8arattykaylahxx

08-07-2016
Mathematics

contestada

find the first fourth and eighth terms of a(n)=-2•5^n-1

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dalendrk dalendrk

16-07-2016

[tex]a_n=2\cdot5^{n-1}\\\\a_1=2\cdot5^{1-1}=2\cdot5^0=2\cdot1=2\\\\a_2=2\cdot5^{2-1}=2\cdot5^1=2\cdot5=10\\\\a_3=2\cdot5^{3-1}=2\cdot5^2=2\cdot25=50\\\\a_4=2\cdot5^{4-1}=2\cdot5^3=2\cdot125=250\\\vdots\\a_8=2\cdot5^{8-1}=2\cdot5^7=2\cdot78,125=156,250[/tex]

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