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7 of 9 - + Automatic Zoom Fig. 1 PROBLEMS In problems 1 - 14, use the substitution method and a known power series to find power series for the given functions. 1. 2. 3. 1 + x 4 1 - X 1 - x 1 1 1 4. 5. 5+x =5 1+ (x/5) 6. 3-x - 3 1-(x/3) 1+x X 9. In( 1 4 x2) 7. 8. 1+ x