Looking for the exact answer for this question and the solution. The practice pr

Question

Looking for the exact answer for this question and the solution.  

The practice problem answer was 2.58E07,  The correct solution should be something similar to this.  Thank you

The light from a nearby star is observed to be shifted toward the blue by 3 percent; that is, f obs = 1. 03 f0. Is the star approaching or receding from Earth? approaching receding not enough information to decide How fast is it moving? (Assume motion is directly toward or away from Earth so as to avoid superluminal speeds. ) m/s

Explanation / Answer

z = v/c

z = -0.03/1.03

v = z*c = -.03/1.03 * 299792.458

v = -8.732 *10^6 m/s

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