exam Maths Puzzle Numerical Ability

Please help w/ the following:

2x^-2+3x^-1+1=0

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exam Other Question

A bicyclist rode into the country for 5 hours. In returning, her speed was 5 miles an hour faster and the trip took 4 hours. what was her speed each way? Light travels approximately 5.87 x 10^12 mi. in one year. This distance is called a light-year. Suppose a star is 2 x 10^4 light-years away. How many miles away is the star?