Finding absolute magnitude given mass and luminosity relative to the sun

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Homework Statement


A star is 42.9 more luminous than our Sun and has a mass 3.5 times bigger than the Sun. Assuming our Sun has an Absolute Magnitude of 4.83 what would the Absolute Magnitude of this star be?


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The Attempt at a Solution

 
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What factor of luminosity change does plus one magnitude represent?
 

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