book Maths Puzzle Numerical Ability

please help me find all the roots of the equation: x^7-2=0

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book Other Question

Sara reduced its price on lawn mowers by $45. The sale price as $169. What was the original price? Name the properties used in each step.
1. =3C+5C+5(2)

2. =(3C+5C)+5(2)

3. =(3+5)C+5(2)

4. =8C+10