at what point on the graph of y=2e^X -1 is the tangent line parallel to the line y= 5x -1

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JKAnnan JKAnnan

17-10-2016
Mathematics

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at what point on the graph of y=2e^X -1 is the tangent line parallel to the line y= 5x -1

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paralell has same slope
y=mx+b
m=slope
y=5x-1
when is the slope 5?

take the derivitive of 2e^x
f'(2e^x)=2f'(e^x)=2e^x

that is the slope
5=2e^x
divide both sides by 2
2.5=e^x
take the ln of both sides
ln2.5=x

when x=ln2.5 they are paralell

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